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(1+3*x^2+5*x)/(-2+4*x^3+6*x^2+7*x)

Gráfico de la función y = (1+3*x^2+5*x)/(-2+4*x^3+6*x^2+7*x)

v

Gráfico:

interior superior

Puntos de intersección:

mostrar?

Definida a trozos:

Solución

Ha introducido [src]
                  2          
           1 + 3*x  + 5*x    
f(x) = ----------------------
               3      2      
       -2 + 4*x  + 6*x  + 7*x
$$f{\left(x \right)} = \frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)}$$
f = (5*x + 3*x^2 + 1)/(7*x + 6*x^2 + 4*x^3 - 2)
Gráfico de la función
Dominio de definición de la función
Puntos en los que la función no está definida exactamente:
$$x_{1} = 0.232297850621388$$
Puntos de cruce con el eje de coordenadas X
El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)} = 0$$
Resolvermos esta ecuación
Puntos de cruce con el eje X:

Solución analítica
$$x_{1} = - \frac{5}{6} - \frac{\sqrt{13}}{6}$$
$$x_{2} = - \frac{5}{6} + \frac{\sqrt{13}}{6}$$
Solución numérica
$$x_{1} = -0.232408120756002$$
$$x_{2} = -1.43425854591066$$
Puntos de cruce con el eje de coordenadas Y
El gráfico cruce el eje Y cuando x es igual a 0:
sustituimos x = 0 en (1 + 3*x^2 + 5*x)/(-2 + 4*x^3 + 6*x^2 + 7*x).
$$\frac{0 \cdot 5 + \left(3 \cdot 0^{2} + 1\right)}{\left(\left(-2 + 4 \cdot 0^{3}\right) + 6 \cdot 0^{2}\right) + 0 \cdot 7}$$
Resultado:
$$f{\left(0 \right)} = - \frac{1}{2}$$
Punto:
(0, -1/2)
Extremos de la función
Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada
$$\frac{\left(5 x + \left(3 x^{2} + 1\right)\right) \left(- 12 x^{2} - 12 x - 7\right)}{\left(7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)\right)^{2}} + \frac{6 x + 5}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)} = 0$$
Resolvermos esta ecuación
Raíces de esta ecuación
$$x_{1} = - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6} + \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2}$$
$$x_{2} = - \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2} - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6}$$
Signos de extremos en los puntos:
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               /                                                  /   8327   \/ 4333683                /             /           _________                                               /             /           _________                                                                                                                                                                                 |            /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------           /    -- + 2*3 /   ----- + -----------  + ------------------------------ |    5*      /    -- + 2*3 /   ----- + -----------  + ------------------------------            /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------                                                                                                                                      
              /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                           /   29        /   8327   \/ 4333683                   1                                                                                                                                                              |           /                                                                                       /     18     \/    13824       3456                _____________________          /     18     \/    13824       3456                _____________________ |           /     18     \/    13824       3456                _____________________           /                                                                                       /     18     \/    13824       3456                _____________________                                                                                                                                      
             /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------           /    -- + 2*3 /   ----- + -----------  + ------------------------------                                                                                                                                               |          /                                                                                       /                                                  /           _________          /                                                  /           _________  |          /                                                  /           _________           /                                                                                       /                                                  /           _________                                                                                                                                       
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           /                                                                                       /                                                  /           _________          /                                                  /           _________                                                                                                                                                |        /                                                                                       /                                            288*3 /   ----- + -----------        /                                            288*3 /   ----- + -----------  |        /                                            288*3 /   ----- + -----------         /                                                                                       /                                            288*3 /   ----- + -----------                                                                                                                                       
          /                                                                                       /                                                  /   8327   \/ 4333683          /                                                  /   8327   \/ 4333683                                                                                                                                          19     |  5   \/                                                                                      \/                                                 \/    13824       3456         \/                                                 \/    13824       3456     |      \/                                                 \/    13824       3456          \/                                                                                      \/                                                 \/    13824       3456                                                                                                                                          
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(- - + ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
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                                                                                                                                                                                                                                                                          |             /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                           /   29        /   8327   \/ 4333683                   1                |      |             /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                           /   29        /   8327   \/ 4333683                   1                |             /   29        /   8327   \/ 4333683                   1                            /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                  
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                /             _____________________                                              /                                                  /           _________                /             _____________________                                                                                                                                                                                 |             /   29        /   8327   \/ 4333683                   1                          /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                 |             /   29        /   8327   \/ 4333683                   1                            /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                                                                                                                                                     
               /             /           _________                                              /                                                  /   8327   \/ 4333683                /             /           _________                                                                                                                                                                                  |            /    -- + 2*3 /   ----- + -----------  + ------------------------------          /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------  |    5*      /    -- + 2*3 /   ----- + -----------  + ------------------------------            /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------                                                                                                                                      
              /   29        /   8327   \/ 4333683                   1                          /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                                                                                                                                                               |           /     18     \/    13824       3456                _____________________         /                                                                                       /     18     \/    13824       3456                _____________________  |           /     18     \/    13824       3456                _____________________           /                                                                                       /     18     \/    13824       3456                _____________________                                                                                                                                      
             /    -- + 2*3 /   ----- + -----------  + ------------------------------          /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------                                                                                                                                                |          /                                                  /           _________         /                                                                                       /                                                  /           _________   |          /                                                  /           _________           /                                                                                       /                                                  /           _________                                                                                                                                       
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           /                                                  /           _________         /                                                                                       /                                                  /           _________                                                                                                                                                 |        /                                            288*3 /   ----- + -----------       /                                                                                       /                                            288*3 /   ----- + -----------   |        /                                            288*3 /   ----- + -----------         /                                                                                       /                                            288*3 /   ----- + -----------                                                                                                                                       
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         /                                            288*3 /   ----- + -----------       /                                                                                       /                                            288*3 /   ----- + -----------                                                                                                                                        - -- + 3*|- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------|  - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------------------------------------------------------------------------------------------------                                                                                                                                    
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(- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
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                                                                                                                                                                                                                                                                          |             /   29        /   8327   \/ 4333683                   1                          /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                 |      |             /   29        /   8327   \/ 4333683                   1                          /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                 |             /   29        /   8327   \/ 4333683                   1                            /                                            288*3 /   ----- + -----------              /   29        /   8327   \/ 4333683                   1                  
                                                                                                                                                                                                                                                                          |            /    -- + 2*3 /   ----- + -----------  + ------------------------------          /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------  |      |            /    -- + 2*3 /   ----- + -----------  + ------------------------------          /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------  |    7*      /    -- + 2*3 /   ----- + -----------  + ------------------------------            /                                                 \/    13824       3456       54*      /    -- + 2*3 /   ----- + -----------  + ------------------------------   
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Intervalos de crecimiento y decrecimiento de la función:
Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
$$x_{1} = - \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2} - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6}$$
Puntos máximos de la función:
$$x_{1} = - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6} + \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2}$$
Decrece en los intervalos
$$\left[- \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2} - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6}, - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6} + \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2}\right]$$
Crece en los intervalos
$$\left(-\infty, - \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2} - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6}\right] \cup \left[- \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6} + \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2}, \infty\right)$$
Asíntotas verticales
Hay:
$$x_{1} = 0.232297850621388$$
Asíntotas horizontales
Hallemos las asíntotas horizontales mediante los límites de esta función con x->+oo y x->-oo
$$\lim_{x \to -\infty}\left(\frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)}\right) = 0$$
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la izquierda:
$$y = 0$$
$$\lim_{x \to \infty}\left(\frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)}\right) = 0$$
Tomamos como el límite
es decir,
ecuación de la asíntota horizontal a la derecha:
$$y = 0$$
Asíntotas inclinadas
Se puede hallar la asíntota inclinada calculando el límite de la función (1 + 3*x^2 + 5*x)/(-2 + 4*x^3 + 6*x^2 + 7*x), dividida por x con x->+oo y x ->-oo
$$\lim_{x \to -\infty}\left(\frac{5 x + \left(3 x^{2} + 1\right)}{x \left(7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)\right)}\right) = 0$$
Tomamos como el límite
es decir,
la inclinada coincide con la asíntota horizontal a la derecha
$$\lim_{x \to \infty}\left(\frac{5 x + \left(3 x^{2} + 1\right)}{x \left(7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)\right)}\right) = 0$$
Tomamos como el límite
es decir,
la inclinada coincide con la asíntota horizontal a la izquierda
Paridad e imparidad de la función
Comprobemos si la función es par o impar mediante las relaciones f = f(-x) и f = -f(-x).
Pues, comprobamos:
$$\frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)} = \frac{3 x^{2} - 5 x + 1}{- 4 x^{3} + 6 x^{2} - 7 x - 2}$$
- No
$$\frac{5 x + \left(3 x^{2} + 1\right)}{7 x + \left(6 x^{2} + \left(4 x^{3} - 2\right)\right)} = - \frac{3 x^{2} - 5 x + 1}{- 4 x^{3} + 6 x^{2} - 7 x - 2}$$
- No
es decir, función
no es
par ni impar
Gráfico
Gráfico de la función y = (1+3*x^2+5*x)/(-2+4*x^3+6*x^2+7*x)