x^3-x^2-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=−1q=acq=−1v=adv=2Fórmulas de Cardano-Vieta
x1+x2+x3=−px1x2+x1x3+x2x3=qx1x2x3=vx1+x2+x3=1x1x2+x1x3+x2x3=−1x1x2x3=2
Gráfica
Suma y producto de raíces
[src]
________________ / ________________\ ________________ / ________________ \ ________________
/ _____ | / _____ | / _____ | / _____ | / _____
/ 43 3*\/ 177 | ___ / 43 3*\/ 177 | / 43 3*\/ 177 | ___ / 43 3*\/ 177 | / 43 3*\/ 177
3 / -- + --------- | ___ \/ 3 *3 / -- + --------- | 3 / -- + --------- | \/ 3 *3 / -- + --------- ___ | 3 / -- + ---------
1 \/ 2 2 2 | 2*\/ 3 \/ 2 2 | 1 \/ 2 2 2 | \/ 2 2 2*\/ 3 | 1 4 \/ 2 2
- + --------------------- + ----------------------- + I*|- ----------------------- + ---------------------------| + - + --------------------- + ----------------------- + I*|- --------------------------- + -----------------------| + - - ----------------------- - ---------------------
3 6 ________________ | ________________ 6 | 3 6 ________________ | 6 ________________| 3 ________________ 3
/ _____ | / _____ | / _____ | / _____ | / _____
/ 43 3*\/ 177 | / 43 3*\/ 177 | / 43 3*\/ 177 | / 43 3*\/ 177 | / 43 3*\/ 177
3*3 / -- + --------- | 3*3 / -- + --------- | 3*3 / -- + --------- | 3*3 / -- + --------- | 3*3 / -- + ---------
\/ 2 2 \ \/ 2 2 / \/ 2 2 \ \/ 2 2 / \/ 2 2
−3323177+243−3323177+2434+31+3323177+2432+31+6323177+243+i−63323177+243+3323177+24323+3323177+2432+31+6323177+243+i−3323177+24323+63323177+243
/ ________________\ / ________________ \
| / _____ | | / _____ |
| ___ / 43 3*\/ 177 | | ___ / 43 3*\/ 177 |
| ___ \/ 3 *3 / -- + --------- | | \/ 3 *3 / -- + --------- ___ |
| 2*\/ 3 \/ 2 2 | | \/ 2 2 2*\/ 3 |
1 + I*|- ----------------------- + ---------------------------| + I*|- --------------------------- + -----------------------|
| ________________ 6 | | 6 ________________|
| / _____ | | / _____ |
| / 43 3*\/ 177 | | / 43 3*\/ 177 |
| 3*3 / -- + --------- | | 3*3 / -- + --------- |
\ \/ 2 2 / \ \/ 2 2 /
1+i−63323177+243+3323177+24323+i−3323177+24323+63323177+243
/ ________________ / ________________\\ / ________________ / ________________ \\ / ________________\
| / _____ | / _____ || | / _____ | / _____ || | / _____ |
| / 43 3*\/ 177 | ___ / 43 3*\/ 177 || | / 43 3*\/ 177 | ___ / 43 3*\/ 177 || | / 43 3*\/ 177 |
| 3 / -- + --------- | ___ \/ 3 *3 / -- + --------- || | 3 / -- + --------- | \/ 3 *3 / -- + --------- ___ || | 3 / -- + --------- |
|1 \/ 2 2 2 | 2*\/ 3 \/ 2 2 || |1 \/ 2 2 2 | \/ 2 2 2*\/ 3 || |1 4 \/ 2 2 |
|- + --------------------- + ----------------------- + I*|- ----------------------- + ---------------------------||*|- + --------------------- + ----------------------- + I*|- --------------------------- + -----------------------||*|- - ----------------------- - ---------------------|
|3 6 ________________ | ________________ 6 || |3 6 ________________ | 6 ________________|| |3 ________________ 3 |
| / _____ | / _____ || | / _____ | / _____ || | / _____ |
| / 43 3*\/ 177 | / 43 3*\/ 177 || | / 43 3*\/ 177 | / 43 3*\/ 177 || | / 43 3*\/ 177 |
| 3*3 / -- + --------- | 3*3 / -- + --------- || | 3*3 / -- + --------- | 3*3 / -- + --------- || | 3*3 / -- + --------- |
\ \/ 2 2 \ \/ 2 2 // \ \/ 2 2 \ \/ 2 2 // \ \/ 2 2 /
3323177+2432+31+6323177+243+i−3323177+24323+63323177+2433323177+2432+31+6323177+243+i−63323177+243+3323177+24323−3323177+243−3323177+2434+31
________________ / ________________\
/ _____ | / _____ |
/ 43 3*\/ 177 | ___ / 43 3*\/ 177 |
3 / -- + --------- | ___ \/ 3 *3 / -- + --------- |
1 \/ 2 2 2 | 2*\/ 3 \/ 2 2 |
x1 = - + --------------------- + ----------------------- + I*|- ----------------------- + ---------------------------|
3 6 ________________ | ________________ 6 |
/ _____ | / _____ |
/ 43 3*\/ 177 | / 43 3*\/ 177 |
3*3 / -- + --------- | 3*3 / -- + --------- |
\/ 2 2 \ \/ 2 2 /
x1=3323177+2432+31+6323177+243+i−3323177+24323+63323177+243
________________ / ________________ \
/ _____ | / _____ |
/ 43 3*\/ 177 | ___ / 43 3*\/ 177 |
3 / -- + --------- | \/ 3 *3 / -- + --------- ___ |
1 \/ 2 2 2 | \/ 2 2 2*\/ 3 |
x2 = - + --------------------- + ----------------------- + I*|- --------------------------- + -----------------------|
3 6 ________________ | 6 ________________|
/ _____ | / _____ |
/ 43 3*\/ 177 | / 43 3*\/ 177 |
3*3 / -- + --------- | 3*3 / -- + --------- |
\/ 2 2 \ \/ 2 2 /
x2=3323177+2432+31+6323177+243+i−63323177+243+3323177+24323
________________
/ _____
/ 43 3*\/ 177
3 / -- + ---------
1 4 \/ 2 2
x3 = - - ----------------------- - ---------------------
3 ________________ 3
/ _____
/ 43 3*\/ 177
3*3 / -- + ---------
\/ 2 2
x3=−3323177+243−3323177+2434+31
x3 = -(3*sqrt(177)/2 + 43/2)^(1/3)/3 - 4/(3*(3*sqrt(177)/2 + 43/2)^(1/3)) + 1/3
x1 = 1.1027847152003 + 0.665456951152813*i
x2 = 1.1027847152003 - 0.665456951152813*i