xxx-2.5x+2.5=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=−25v=adv=25Fórmulas de Cardano-Vieta
x1+x2+x3=−px1x2+x1x3+x2x3=qx1x2x3=vx1+x2+x3=0x1x2+x1x3+x2x3=−25x1x2x3=25
Gráfica
_________________ / _________________\
/ ____ | / ____ |
/ 135 15*\/ 51 | ___ / 135 15*\/ 51 |
3 / --- + --------- | ___ \/ 3 *3 / --- + --------- |
\/ 4 4 5 | 5*\/ 3 \/ 4 4 |
x1 = ---------------------- + ------------------------ + I*|- ------------------------ + ----------------------------|
6 _________________ | _________________ 6 |
/ ____ | / ____ |
/ 135 15*\/ 51 | / 135 15*\/ 51 |
4*3 / --- + --------- | 4*3 / --- + --------- |
\/ 4 4 \ \/ 4 4 /
x1=4341551+41355+6341551+4135+i−4341551+413553+63341551+4135
_________________ / _________________ \
/ ____ | / ____ |
/ 135 15*\/ 51 | ___ / 135 15*\/ 51 |
3 / --- + --------- | \/ 3 *3 / --- + --------- ___ |
\/ 4 4 5 | \/ 4 4 5*\/ 3 |
x2 = ---------------------- + ------------------------ + I*|- ---------------------------- + ------------------------|
6 _________________ | 6 _________________|
/ ____ | / ____ |
/ 135 15*\/ 51 | / 135 15*\/ 51 |
4*3 / --- + --------- | 4*3 / --- + --------- |
\/ 4 4 \ \/ 4 4 /
x2=4341551+41355+6341551+4135+i−63341551+4135+4341551+413553
_________________
/ ____
/ 135 15*\/ 51
3 / --- + ---------
5 \/ 4 4
x3 = - ------------------------ - ----------------------
_________________ 3
/ ____
/ 135 15*\/ 51
2*3 / --- + ---------
\/ 4 4
x3=−3341551+4135−2341551+41355
x3 = -(15*sqrt(51)/4 + 135/4)^(1/3)/3 - 5/(2*(15*sqrt(51)/4 + 135/4)^(1/3))
Suma y producto de raíces
[src]
_________________ / _________________\ _________________ / _________________ \ _________________
/ ____ | / ____ | / ____ | / ____ | / ____
/ 135 15*\/ 51 | ___ / 135 15*\/ 51 | / 135 15*\/ 51 | ___ / 135 15*\/ 51 | / 135 15*\/ 51
3 / --- + --------- | ___ \/ 3 *3 / --- + --------- | 3 / --- + --------- | \/ 3 *3 / --- + --------- ___ | 3 / --- + ---------
\/ 4 4 5 | 5*\/ 3 \/ 4 4 | \/ 4 4 5 | \/ 4 4 5*\/ 3 | 5 \/ 4 4
---------------------- + ------------------------ + I*|- ------------------------ + ----------------------------| + ---------------------- + ------------------------ + I*|- ---------------------------- + ------------------------| + - ------------------------ - ----------------------
6 _________________ | _________________ 6 | 6 _________________ | 6 _________________| _________________ 3
/ ____ | / ____ | / ____ | / ____ | / ____
/ 135 15*\/ 51 | / 135 15*\/ 51 | / 135 15*\/ 51 | / 135 15*\/ 51 | / 135 15*\/ 51
4*3 / --- + --------- | 4*3 / --- + --------- | 4*3 / --- + --------- | 4*3 / --- + --------- | 2*3 / --- + ---------
\/ 4 4 \ \/ 4 4 / \/ 4 4 \ \/ 4 4 / \/ 4 4
−3341551+4135−2341551+41355+4341551+41355+6341551+4135+i−63341551+4135+4341551+413553+4341551+41355+6341551+4135+i−4341551+413553+63341551+4135
/ _________________\ / _________________ \
| / ____ | | / ____ |
| ___ / 135 15*\/ 51 | | ___ / 135 15*\/ 51 |
| ___ \/ 3 *3 / --- + --------- | | \/ 3 *3 / --- + --------- ___ |
| 5*\/ 3 \/ 4 4 | | \/ 4 4 5*\/ 3 |
I*|- ------------------------ + ----------------------------| + I*|- ---------------------------- + ------------------------|
| _________________ 6 | | 6 _________________|
| / ____ | | / ____ |
| / 135 15*\/ 51 | | / 135 15*\/ 51 |
| 4*3 / --- + --------- | | 4*3 / --- + --------- |
\ \/ 4 4 / \ \/ 4 4 /
i−63341551+4135+4341551+413553+i−4341551+413553+63341551+4135
/ _________________ / _________________\\ / _________________ / _________________ \\ / _________________\
| / ____ | / ____ || | / ____ | / ____ || | / ____ |
| / 135 15*\/ 51 | ___ / 135 15*\/ 51 || | / 135 15*\/ 51 | ___ / 135 15*\/ 51 || | / 135 15*\/ 51 |
|3 / --- + --------- | ___ \/ 3 *3 / --- + --------- || |3 / --- + --------- | \/ 3 *3 / --- + --------- ___ || | 3 / --- + --------- |
|\/ 4 4 5 | 5*\/ 3 \/ 4 4 || |\/ 4 4 5 | \/ 4 4 5*\/ 3 || | 5 \/ 4 4 |
|---------------------- + ------------------------ + I*|- ------------------------ + ----------------------------||*|---------------------- + ------------------------ + I*|- ---------------------------- + ------------------------||*|- ------------------------ - ----------------------|
| 6 _________________ | _________________ 6 || | 6 _________________ | 6 _________________|| | _________________ 3 |
| / ____ | / ____ || | / ____ | / ____ || | / ____ |
| / 135 15*\/ 51 | / 135 15*\/ 51 || | / 135 15*\/ 51 | / 135 15*\/ 51 || | / 135 15*\/ 51 |
| 4*3 / --- + --------- | 4*3 / --- + --------- || | 4*3 / --- + --------- | 4*3 / --- + --------- || | 2*3 / --- + --------- |
\ \/ 4 4 \ \/ 4 4 // \ \/ 4 4 \ \/ 4 4 // \ \/ 4 4 /
4341551+41355+6341551+4135+i−4341551+413553+63341551+41354341551+41355+6341551+4135+i−63341551+4135+4341551+413553−3341551+4135−2341551+41355
x2 = 0.972755103270916 - 0.582028756006808*i
x3 = 0.972755103270916 + 0.582028756006808*i
x3 = 0.972755103270916 + 0.582028756006808*i