Sr Examen

Otras calculadoras


9*x+x^3+6*x^2+8=0

9*x+x^3+6*x^2+8=0 la ecuación

El profesor se sorprenderá mucho al ver tu solución correcta😉

v

Solución numérica:

Buscar la solución numérica en el intervalo [, ]

Solución

Ha introducido [src]
       3      2        
9*x + x  + 6*x  + 8 = 0
(6x2+(x3+9x))+8=0\left(6 x^{2} + \left(x^{3} + 9 x\right)\right) + 8 = 0
Teorema de Cardano-Vieta
es ecuación cúbica reducida
px2+qx+v+x3=0p x^{2} + q x + v + x^{3} = 0
donde
p=bap = \frac{b}{a}
p=6p = 6
q=caq = \frac{c}{a}
q=9q = 9
v=dav = \frac{d}{a}
v=8v = 8
Fórmulas de Cardano-Vieta
x1+x2+x3=px_{1} + x_{2} + x_{3} = - p
x1x2+x1x3+x2x3=qx_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = q
x1x2x3=vx_{1} x_{2} x_{3} = v
x1+x2+x3=6x_{1} + x_{2} + x_{3} = -6
x1x2+x1x3+x2x3=9x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = 9
x1x2x3=8x_{1} x_{2} x_{3} = 8
Gráfica
-20.0-17.5-15.0-12.5-10.0-7.5-5.0-2.50.02.55.07.5-25002500
Suma y producto de raíces [src]
suma
        _______________                            /                                  _______________\           _______________                            /           _______________                       \                                _______________
     3 /           ___                             |            ___            ___ 3 /           ___ |        3 /           ___                             |    ___ 3 /           ___              ___       |                             3 /           ___ 
     \/  81 + 54*\/ 2              3               |        3*\/ 3           \/ 3 *\/  81 + 54*\/ 2  |        \/  81 + 54*\/ 2              3               |  \/ 3 *\/  81 + 54*\/ 2           3*\/ 3        |                3            \/  81 + 54*\/ 2  
-2 + ------------------ + -------------------- + I*|- -------------------- + ------------------------| + -2 + ------------------ + -------------------- + I*|- ------------------------ + --------------------| + -2 - ------------------ - ------------------
             6                 _______________     |       _______________              6            |                6                 _______________     |             6                    _______________|           _______________           3         
                            3 /           ___      |    3 /           ___                            |                               3 /           ___      |                               3 /           ___ |        3 /           ___                      
                          2*\/  81 + 54*\/ 2       \  2*\/  81 + 54*\/ 2                             /                             2*\/  81 + 54*\/ 2       \                             2*\/  81 + 54*\/ 2  /        \/  81 + 54*\/ 2                       
(2542+81333542+813)+((2+32542+813+542+8136+i(3542+8136+332542+813))+(2+32542+813+542+8136+i(332542+813+3542+8136)))\left(-2 - \frac{\sqrt[3]{54 \sqrt{2} + 81}}{3} - \frac{3}{\sqrt[3]{54 \sqrt{2} + 81}}\right) + \left(\left(-2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6} + \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}}\right)\right) + \left(-2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6}\right)\right)\right)
=
       /                                  _______________\     /           _______________                       \
       |            ___            ___ 3 /           ___ |     |    ___ 3 /           ___              ___       |
       |        3*\/ 3           \/ 3 *\/  81 + 54*\/ 2  |     |  \/ 3 *\/  81 + 54*\/ 2           3*\/ 3        |
-6 + I*|- -------------------- + ------------------------| + I*|- ------------------------ + --------------------|
       |       _______________              6            |     |             6                    _______________|
       |    3 /           ___                            |     |                               3 /           ___ |
       \  2*\/  81 + 54*\/ 2                             /     \                             2*\/  81 + 54*\/ 2  /
6+i(3542+8136+332542+813)+i(332542+813+3542+8136)-6 + i \left(- \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6} + \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}}\right) + i \left(- \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6}\right)
producto
/        _______________                            /                                  _______________\\ /        _______________                            /           _______________                       \\ /                             _______________\
|     3 /           ___                             |            ___            ___ 3 /           ___ || |     3 /           ___                             |    ___ 3 /           ___              ___       || |                          3 /           ___ |
|     \/  81 + 54*\/ 2              3               |        3*\/ 3           \/ 3 *\/  81 + 54*\/ 2  || |     \/  81 + 54*\/ 2              3               |  \/ 3 *\/  81 + 54*\/ 2           3*\/ 3        || |             3            \/  81 + 54*\/ 2  |
|-2 + ------------------ + -------------------- + I*|- -------------------- + ------------------------||*|-2 + ------------------ + -------------------- + I*|- ------------------------ + --------------------||*|-2 - ------------------ - ------------------|
|             6                 _______________     |       _______________              6            || |             6                 _______________     |             6                    _______________|| |        _______________           3         |
|                            3 /           ___      |    3 /           ___                            || |                            3 /           ___      |                               3 /           ___ || |     3 /           ___                      |
\                          2*\/  81 + 54*\/ 2       \  2*\/  81 + 54*\/ 2                             // \                          2*\/  81 + 54*\/ 2       \                             2*\/  81 + 54*\/ 2  // \     \/  81 + 54*\/ 2                       /
(2+32542+813+542+8136+i(332542+813+3542+8136))(2+32542+813+542+8136+i(3542+8136+332542+813))(2542+81333542+813)\left(-2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6}\right)\right) \left(-2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6} + \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}}\right)\right) \left(-2 - \frac{\sqrt[3]{54 \sqrt{2} + 81}}{3} - \frac{3}{\sqrt[3]{54 \sqrt{2} + 81}}\right)
=
-8
8-8
-8
Respuesta rápida [src]
             _______________                            /                                  _______________\
          3 /           ___                             |            ___            ___ 3 /           ___ |
          \/  81 + 54*\/ 2              3               |        3*\/ 3           \/ 3 *\/  81 + 54*\/ 2  |
x1 = -2 + ------------------ + -------------------- + I*|- -------------------- + ------------------------|
                  6                 _______________     |       _______________              6            |
                                 3 /           ___      |    3 /           ___                            |
                               2*\/  81 + 54*\/ 2       \  2*\/  81 + 54*\/ 2                             /
x1=2+32542+813+542+8136+i(332542+813+3542+8136)x_{1} = -2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6}\right)
             _______________                            /           _______________                       \
          3 /           ___                             |    ___ 3 /           ___              ___       |
          \/  81 + 54*\/ 2              3               |  \/ 3 *\/  81 + 54*\/ 2           3*\/ 3        |
x2 = -2 + ------------------ + -------------------- + I*|- ------------------------ + --------------------|
                  6                 _______________     |             6                    _______________|
                                 3 /           ___      |                               3 /           ___ |
                               2*\/  81 + 54*\/ 2       \                             2*\/  81 + 54*\/ 2  /
x2=2+32542+813+542+8136+i(3542+8136+332542+813)x_{2} = -2 + \frac{3}{2 \sqrt[3]{54 \sqrt{2} + 81}} + \frac{\sqrt[3]{54 \sqrt{2} + 81}}{6} + i \left(- \frac{\sqrt{3} \sqrt[3]{54 \sqrt{2} + 81}}{6} + \frac{3 \sqrt{3}}{2 \sqrt[3]{54 \sqrt{2} + 81}}\right)
                                  _______________
                               3 /           ___ 
                  3            \/  81 + 54*\/ 2  
x3 = -2 - ------------------ - ------------------
             _______________           3         
          3 /           ___                      
          \/  81 + 54*\/ 2                       
x3=2542+81333542+813x_{3} = -2 - \frac{\sqrt[3]{54 \sqrt{2} + 81}}{3} - \frac{3}{\sqrt[3]{54 \sqrt{2} + 81}}
x3 = -2 - (54*sqrt(2) + 81)^(1/3)/3 - 3/(54*sqrt(2) + 81)^(1/3)
Respuesta numérica [src]
x1 = -4.35530139760812
x2 = -0.82234930119594 - 1.07730381284996*i
x3 = -0.82234930119594 + 1.07730381284996*i
x3 = -0.82234930119594 + 1.07730381284996*i
Gráfico
9*x+x^3+6*x^2+8=0 la ecuación