9*x+x^3+6*x^2+8=0 la ecuación
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Solución
Teorema de Cardano-Vieta
es ecuación cúbica reducida
px2+qx+v+x3=0donde
p=abp=6q=acq=9v=adv=8Fórmulas de Cardano-Vieta
x1+x2+x3=−px1x2+x1x3+x2x3=qx1x2x3=vx1+x2+x3=−6x1x2+x1x3+x2x3=9x1x2x3=8
Gráfica
Suma y producto de raíces
[src]
_______________ / _______________\ _______________ / _______________ \ _______________
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
(−2−33542+81−3542+813)+((−2+23542+813+63542+81+i(−633542+81+23542+8133))+(−2+23542+813+63542+81+i(−23542+8133+633542+81)))
/ _______________\ / _______________ \
| ___ ___ 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(−633542+81+23542+8133)+i(−23542+8133+633542+81)
/ _______________ / _______________\\ / _______________ / _______________ \\ / _______________\
| 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+23542+813+63542+81+i(−23542+8133+633542+81))(−2+23542+813+63542+81+i(−633542+81+23542+8133))(−2−33542+81−3542+813)
_______________ / _______________\
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+23542+813+63542+81+i(−23542+8133+633542+81)
_______________ / _______________ \
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+23542+813+63542+81+i(−633542+81+23542+8133)
_______________
3 / ___
3 \/ 81 + 54*\/ 2
x3 = -2 - ------------------ - ------------------
_______________ 3
3 / ___
\/ 81 + 54*\/ 2
x3=−2−33542+81−3542+813
x3 = -2 - (54*sqrt(2) + 81)^(1/3)/3 - 3/(54*sqrt(2) + 81)^(1/3)
x2 = -0.82234930119594 - 1.07730381284996*i
x3 = -0.82234930119594 + 1.07730381284996*i
x3 = -0.82234930119594 + 1.07730381284996*i