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 ecuaciónRaíces 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:
2
/ ________________________________________________________________________________________________________________________________________________________ \ ________________________________________________________________________________________________________________________________________________________
| / _____________________ | / _____________________
________________________________________________________________________________________________________________________________________________________ | / / _________ | / / _________
/ _____________________ | / 29 / 8327 \/ 4333683 1 401 | / 29 / 8327 \/ 4333683 1 401
/ / _________ | / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | 5* / -- - 2*3 / ----- + ----------- - ------------------------------ + ---------------------------------------------------------------------------------
/ 29 / 8327 \/ 4333683 1 401 | / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ ____________________________________________________________________| ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________
/ -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | / / _________ / _____________________ / _____________________ | / _____________________ / / _________ / _____________________
/ 9 \/ 13824 3456 _____________________ ____________________________________________________________________ ____________________________________________________________________ | / / 8327 \/ 4333683 / / _________ / / _________ | / / _________ / / 8327 \/ 4333683 / / _________
/ / _________ / _____________________ / _____________________ | / 288*3 / ----- + ----------- / 29 / 8327 \/ 4333683 1 / 29 / 8327 \/ 4333683 1 | / 29 / 8327 \/ 4333683 1 / 288*3 / ----- + ----------- / 29 / 8327 \/ 4333683 1
/ / 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 / ----- + ----------- + ------------------------------ | / / / _________ / / _________ | / / _________ / / / _________
/ / 18 \/ 13824 3456 _____________________ / 18 \/ 13824 3456 _____________________ | / / / 8327 \/ 4333683 / / 8327 \/ 4333683 | / / 8327 \/ 4333683 / / / 8327 \/ 4333683
/ / / _________ / / _________ | / / 288*3 / ----- + ----------- / 288*3 / ----- + ----------- | / 288*3 / ----- + ----------- / / 288*3 / ----- + -----------
/ / / 8327 \/ 4333683 / / 8327 \/ 4333683 19 | 5 \/ \/ \/ 13824 3456 \/ \/ 13824 3456 | \/ \/ 13824 3456 \/ \/ \/ 13824 3456
/ / 288*3 / ----- + ----------- / 288*3 / ----- + ----------- - -- + 3*|- - + ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------| - -------------------------------------------------------------------------------- + -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5 \/ \/ \/ 13824 3456 \/ \/ 13824 3456 6 \ 6 2 2 / 2 2
(- - + ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
6 2 2 3 2
/ ________________________________________________________________________________________________________________________________________________________ \ / ________________________________________________________________________________________________________________________________________________________ \ ________________________________________________________________________________________________________________________________________________________
| / _____________________ | | / _____________________ | / _____________________
| / / _________ | | / / _________ | / / _________
| / 29 / 8327 \/ 4333683 1 401 | | / 29 / 8327 \/ 4333683 1 401 | / 29 / 8327 \/ 4333683 1 401
| / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | | / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | 7* / -- - 2*3 / ----- + ----------- - ------------------------------ + ---------------------------------------------------------------------------------
| / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ ____________________________________________________________________| | / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ ____________________________________________________________________| ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________
| / / _________ / _____________________ / _____________________ | | / / _________ / _____________________ / _____________________ | / _____________________ / / _________ / _____________________
| / / 8327 \/ 4333683 / / _________ / / _________ | | / / 8327 \/ 4333683 / / _________ / / _________ | / / _________ / / 8327 \/ 4333683 / / _________
| / 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
| / \/ 13824 3456 54* / -- + 2*3 / ----- + ----------- + ------------------------------ / -- + 2*3 / ----- + ----------- + ------------------------------ | | / \/ 13824 3456 54* / -- + 2*3 / ----- + ----------- + ------------------------------ / -- + 2*3 / ----- + ----------- + ------------------------------ | 7* / -- + 2*3 / ----- + ----------- + ------------------------------ / \/ 13824 3456 54* / -- + 2*3 / ----- + ----------- + ------------------------------
| / / 18 \/ 13824 3456 _____________________ / 18 \/ 13824 3456 _____________________ | | / / 18 \/ 13824 3456 _____________________ / 18 \/ 13824 3456 _____________________ | / 18 \/ 13824 3456 _____________________ / / 18 \/ 13824 3456 _____________________
| / / / _________ / / _________ | | / / / _________ / / _________ | / / _________ / / / _________
| / / / 8327 \/ 4333683 / / 8327 \/ 4333683 | | / / / 8327 \/ 4333683 / / 8327 \/ 4333683 | / / 8327 \/ 4333683 / / / 8327 \/ 4333683
| / / 288*3 / ----- + ----------- / 288*3 / ----- + ----------- | | / / 288*3 / ----- + ----------- / 288*3 / ----- + ----------- | / 288*3 / ----- + ----------- / / 288*3 / ----- + -----------
47 | 5 \/ \/ \/ 13824 3456 \/ \/ 13824 3456 | | 5 \/ \/ \/ 13824 3456 \/ \/ 13824 3456 | \/ \/ 13824 3456 \/ \/ \/ 13824 3456
- -- + 4*|- - + ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------| + 6*|- - + ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------| - -------------------------------------------------------------------------------- + -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6 \ 6 2 2 / \ 6 2 2 / 2 2
2
/ ________________________________________________________________________________________________________________________________________________________\ ________________________________________________________________________________________________________________________________________________________
| / _____________________ | / _____________________
________________________________________________________________________________________________________________________________________________________ | / / _________ | / / _________
/ _____________________ | / 29 / 8327 \/ 4333683 1 401 | / 29 / 8327 \/ 4333683 1 401
/ / _________ | / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | 5* / -- - 2*3 / ----- + ----------- - ------------------------------ + ---------------------------------------------------------------------------------
/ 29 / 8327 \/ 4333683 1 401 | ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ | ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________
/ -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | / _____________________ / / _________ / _____________________ | / _____________________ / / _________ / _____________________
____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ | / / _________ / / 8327 \/ 4333683 / / _________ | / / _________ / / 8327 \/ 4333683 / / _________
/ _____________________ / / _________ / _____________________ | / 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 / ----- + ----------- + ------------------------------ | / / _________ / / / _________ | / / _________ / / / _________
/ 18 \/ 13824 3456 _____________________ / / 18 \/ 13824 3456 _____________________ | / / 8327 \/ 4333683 / / / 8327 \/ 4333683 | / / 8327 \/ 4333683 / / / 8327 \/ 4333683
/ / _________ / / / _________ | / 288*3 / ----- + ----------- / / 288*3 / ----- + ----------- | / 288*3 / ----- + ----------- / / 288*3 / ----- + -----------
/ / 8327 \/ 4333683 / / / 8327 \/ 4333683 19 | 5 \/ \/ 13824 3456 \/ \/ \/ 13824 3456 | \/ \/ 13824 3456 \/ \/ \/ 13824 3456
/ 288*3 / ----- + ----------- / / 288*3 / ----- + ----------- - -- + 3*|- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------| - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5 \/ \/ 13824 3456 \/ \/ \/ 13824 3456 6 \ 6 2 2 / 2 2
(- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
6 2 2 3 2
/ ________________________________________________________________________________________________________________________________________________________\ / ________________________________________________________________________________________________________________________________________________________\ ________________________________________________________________________________________________________________________________________________________
| / _____________________ | | / _____________________ | / _____________________
| / / _________ | | / / _________ | / / _________
| / 29 / 8327 \/ 4333683 1 401 | | / 29 / 8327 \/ 4333683 1 401 | / 29 / 8327 \/ 4333683 1 401
| / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | | / -- - 2*3 / ----- + ----------- - ------------------------------ + --------------------------------------------------------------------------------- | 7* / -- - 2*3 / ----- + ----------- - ------------------------------ + ---------------------------------------------------------------------------------
| ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ | | ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________ | ____________________________________________________________________ / 9 \/ 13824 3456 _____________________ ____________________________________________________________________
| / _____________________ / / _________ / _____________________ | | / _____________________ / / _________ / _____________________ | / _____________________ / / _________ / _____________________
| / / _________ / / 8327 \/ 4333683 / / _________ | | / / _________ / / 8327 \/ 4333683 / / _________ | / / _________ / / 8327 \/ 4333683 / / _________
| / 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 / ----- + ----------- + ------------------------------
| / 18 \/ 13824 3456 _____________________ / / 18 \/ 13824 3456 _____________________ | | / 18 \/ 13824 3456 _____________________ / / 18 \/ 13824 3456 _____________________ | / 18 \/ 13824 3456 _____________________ / / 18 \/ 13824 3456 _____________________
| / / _________ / / / _________ | | / / _________ / / / _________ | / / _________ / / / _________
| / / 8327 \/ 4333683 / / / 8327 \/ 4333683 | | / / 8327 \/ 4333683 / / / 8327 \/ 4333683 | / / 8327 \/ 4333683 / / / 8327 \/ 4333683
| / 288*3 / ----- + ----------- / / 288*3 / ----- + ----------- | | / 288*3 / ----- + ----------- / / 288*3 / ----- + ----------- | / 288*3 / ----- + ----------- / / 288*3 / ----- + -----------
47 | 5 \/ \/ 13824 3456 \/ \/ \/ 13824 3456 | | 5 \/ \/ 13824 3456 \/ \/ \/ 13824 3456 | \/ \/ 13824 3456 \/ \/ \/ 13824 3456
- -- + 4*|- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------| + 6*|- - - ------------------------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------| - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6 \ 6 2 2 / \ 6 2 2 / 2 2
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
$$\left(-\infty, - \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2} - \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6}\right] \cup \left[- \frac{\sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}{2} - \frac{5}{6} + \frac{\sqrt{- 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}} - \frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{9} + \frac{401}{54 \sqrt{\frac{1}{288 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}} + \frac{29}{18} + 2 \sqrt[3]{\frac{\sqrt{4333683}}{3456} + \frac{8327}{13824}}}}}}{2}, \infty\right)$$