x^3+3*x+2=0 la ecuación
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Solución
Teorema de Cardano-Vieta
es ecuación cúbica reducida
px2+qx+v+x3=0donde
p=abp=0q=acq=3v=adv=2Fórmulas de Cardano-Vieta
x1+x2+x3=−px1x2+x1x3+x2x3=qx1x2x3=vx1+x2+x3=0x1x2+x1x3+x2x3=3x1x2x3=2
Gráfica
Suma y producto de raíces
[src]
_______________ / _______________ \ _______________ / _______________\ _______________
3 / ___ | ___ 3 / ___ ___ | 3 / ___ | ___ ___ 3 / ___ | 3 / ___
3 \/ 27 + 27*\/ 2 |\/ 3 *\/ 27 + 27*\/ 2 3*\/ 3 | 3 \/ 27 + 27*\/ 2 | 3*\/ 3 \/ 3 *\/ 27 + 27*\/ 2 | 3 \/ 27 + 27*\/ 2
- -------------------- + ------------------ + I*|------------------------ + --------------------| + - -------------------- + ------------------ + I*|- -------------------- - ------------------------| + ------------------ - ------------------
_______________ 6 | 6 _______________| _______________ 6 | _______________ 6 | _______________ 3
3 / ___ | 3 / ___ | 3 / ___ | 3 / ___ | 3 / ___
2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 / 2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 / \/ 27 + 27*\/ 2
(−3327+272+327+2723)+((−2327+2723+6327+272+i(−63327+272−2327+27233))+(−2327+2723+6327+272+i(2327+27233+63327+272)))
/ _______________\ / _______________ \
| ___ ___ 3 / ___ | | ___ 3 / ___ ___ |
| 3*\/ 3 \/ 3 *\/ 27 + 27*\/ 2 | |\/ 3 *\/ 27 + 27*\/ 2 3*\/ 3 |
I*|- -------------------- - ------------------------| + I*|------------------------ + --------------------|
| _______________ 6 | | 6 _______________|
| 3 / ___ | | 3 / ___ |
\ 2*\/ 27 + 27*\/ 2 / \ 2*\/ 27 + 27*\/ 2 /
i(−63327+272−2327+27233)+i(2327+27233+63327+272)
/ _______________ / _______________ \\ / _______________ / _______________\\ / _______________\
| 3 / ___ | ___ 3 / ___ ___ || | 3 / ___ | ___ ___ 3 / ___ || | 3 / ___ |
| 3 \/ 27 + 27*\/ 2 |\/ 3 *\/ 27 + 27*\/ 2 3*\/ 3 || | 3 \/ 27 + 27*\/ 2 | 3*\/ 3 \/ 3 *\/ 27 + 27*\/ 2 || | 3 \/ 27 + 27*\/ 2 |
|- -------------------- + ------------------ + I*|------------------------ + --------------------||*|- -------------------- + ------------------ + I*|- -------------------- - ------------------------||*|------------------ - ------------------|
| _______________ 6 | 6 _______________|| | _______________ 6 | _______________ 6 || | _______________ 3 |
| 3 / ___ | 3 / ___ || | 3 / ___ | 3 / ___ || |3 / ___ |
\ 2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 // \ 2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 // \\/ 27 + 27*\/ 2 /
(−2327+2723+6327+272+i(2327+27233+63327+272))(−2327+2723+6327+272+i(−63327+272−2327+27233))(−3327+272+327+2723)
_______________ / _______________ \
3 / ___ | ___ 3 / ___ ___ |
3 \/ 27 + 27*\/ 2 |\/ 3 *\/ 27 + 27*\/ 2 3*\/ 3 |
x1 = - -------------------- + ------------------ + I*|------------------------ + --------------------|
_______________ 6 | 6 _______________|
3 / ___ | 3 / ___ |
2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 /
x1=−2327+2723+6327+272+i(2327+27233+63327+272)
_______________ / _______________\
3 / ___ | ___ ___ 3 / ___ |
3 \/ 27 + 27*\/ 2 | 3*\/ 3 \/ 3 *\/ 27 + 27*\/ 2 |
x2 = - -------------------- + ------------------ + I*|- -------------------- - ------------------------|
_______________ 6 | _______________ 6 |
3 / ___ | 3 / ___ |
2*\/ 27 + 27*\/ 2 \ 2*\/ 27 + 27*\/ 2 /
x2=−2327+2723+6327+272+i(−63327+272−2327+27233)
_______________
3 / ___
3 \/ 27 + 27*\/ 2
x3 = ------------------ - ------------------
_______________ 3
3 / ___
\/ 27 + 27*\/ 2
x3=−3327+272+327+2723
x3 = -(27 + 27*sqrt(2))^(1/3)/3 + 3/(27 + 27*sqrt(2))^(1/3)
x2 = 0.298035818991661 + 1.80733949445202*i
x3 = 0.298035818991661 - 1.80733949445202*i
x3 = 0.298035818991661 - 1.80733949445202*i