Para hallar los extremos hay que resolver la ecuación
d d x f ( x ) = 0 \frac{d}{d x} f{\left(x \right)} = 0 d x d f ( x ) = 0 (la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
d d x f ( x ) = \frac{d}{d x} f{\left(x \right)} = d x d f ( x ) = primera derivada − 12 x 3 ( 3 x + ( x 4 + 1 ) ) ( 3 x 4 + 5 ) 2 + 4 x 3 + 3 3 x 4 + 5 = 0 - \frac{12 x^{3} \left(3 x + \left(x^{4} + 1\right)\right)}{\left(3 x^{4} + 5\right)^{2}} + \frac{4 x^{3} + 3}{3 x^{4} + 5} = 0 − ( 3 x 4 + 5 ) 2 12 x 3 ( 3 x + ( x 4 + 1 ) ) + 3 x 4 + 5 4 x 3 + 3 = 0 Resolvermos esta ecuación Raíces de esta ecuación
x 1 = − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 + − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 x_{1} = \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} + \frac{\sqrt{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}}{2} x 1 = 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 + 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 x 2 = − − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 x_{2} = - \frac{\sqrt{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}}{2} + \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} x 2 = − 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 + 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 Signos de extremos en los puntos:
4
/ _______________________________________________________________________________________________________________________________________________________________\ _______________________________________________________________________________________________________________________________________________________________
| / ______________________ | / ______________________
_______________________________________________________________________________________________________________________________________________________________ | / / _______ | / / _______
/ ______________________ | / 32 / 20 5*\/ 10951 10 128 | / 32 / 20 5*\/ 10951 10 128
/ / _______ | / --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- | 3* / --- - 2*3 / - ---- + ----------- + ------------------------------ + --------------------------------------------------------------------------------------
/ 32 / 20 5*\/ 10951 10 128 | ______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ | ______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________
/ --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- | / ______________________ / / _______ / ______________________ | / ______________________ / / _______ / ______________________
______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ | / / _______ / / 20 5*\/ 10951 / / _______ | / / _______ / / 20 5*\/ 10951 / / _______
/ ______________________ / / _______ / ______________________ | / 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 | / 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10
/ / _______ / / 20 5*\/ 10951 / / _______ | / --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ | 3* / --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------
/ 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 | / 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ | / 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________
/ --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ | / / _______ / / / _______ | / / _______ / / / _______
/ 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ | / / 20 5*\/ 10951 / / / 20 5*\/ 10951 | / / 20 5*\/ 10951 / / / 20 5*\/ 10951
/ / _______ / / / _______ | / 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- | / 27*3 / - ---- + ----------- / / 27*3 / - ---- + -----------
/ / 20 5*\/ 10951 / / / 20 5*\/ 10951 11 |2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 | \/ \/ 6561 6561 \/ \/ \/ 6561 6561
/ 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- -- + |-- + -------------------------------------------------------------------------------- + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| + ---------------------------------------------------------------------------------- + --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 9 \27 2 2 / 2 2
(-- + -------------------------------------------------------------------------------- + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------, ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
27 2 2 4
/ _______________________________________________________________________________________________________________________________________________________________\
| / ______________________ |
| / / _______ |
| / 32 / 20 5*\/ 10951 10 128 |
| / --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- |
| ______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ |
| / ______________________ / / _______ / ______________________ |
| / / _______ / / 20 5*\/ 10951 / / _______ |
| / 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 |
| / --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ |
| / 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ |
| / / _______ / / / _______ |
| / / 20 5*\/ 10951 / / / 20 5*\/ 10951 |
| / 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- |
|2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 |
5 + 3*|-- + -------------------------------------------------------------------------------- + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
\27 2 2 / 4
/ _______________________________________________________________________________________________________________________________________________________________\ _______________________________________________________________________________________________________________________________________________________________
| / ______________________ | / ______________________
_______________________________________________________________________________________________________________________________________________________________ | / / _______ | / / _______
/ ______________________ | / 32 / 20 5*\/ 10951 10 128 | / 32 / 20 5*\/ 10951 10 128
/ / _______ | / --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- | 3* / --- - 2*3 / - ---- + ----------- + ------------------------------ + --------------------------------------------------------------------------------------
/ 32 / 20 5*\/ 10951 10 128 | ______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ | / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ ______________________________________________________________________
/ --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- | / ______________________ / / _______ / ______________________ | / / _______ / ______________________ / ______________________
______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ | / / _______ / / 20 5*\/ 10951 / / _______ | / / 20 5*\/ 10951 / / _______ / / _______
/ ______________________ / / _______ / ______________________ | / 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 | / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 / 16 / 20 5*\/ 10951 10
/ / _______ / / 20 5*\/ 10951 / / _______ | / --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ | / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ 3* / --- + 2*3 / - ---- + ----------- - ------------------------------
/ 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 | / 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ | / / 729 \/ 6561 6561 ______________________ / 729 \/ 6561 6561 ______________________
/ --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ | / / _______ / / / _______ | / / / _______ / / _______
/ 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ | / / 20 5*\/ 10951 / / / 20 5*\/ 10951 | / / / 20 5*\/ 10951 / / 20 5*\/ 10951
/ / _______ / / / _______ | / 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- | / / 27*3 / - ---- + ----------- / 27*3 / - ---- + -----------
/ / 20 5*\/ 10951 / / / 20 5*\/ 10951 11 |2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 | \/ \/ \/ 6561 6561 \/ \/ 6561 6561
/ 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- -- + |-- + -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| - -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- + ----------------------------------------------------------------------------------
2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 9 \27 2 2 / 2 2
(-- + -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------, ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
27 2 2 4
/ _______________________________________________________________________________________________________________________________________________________________\
| / ______________________ |
| / / _______ |
| / 32 / 20 5*\/ 10951 10 128 |
| / --- - 2*3 / - ---- + ----------- + ------------------------------ + -------------------------------------------------------------------------------------- |
| ______________________________________________________________________ / 729 \/ 6561 6561 ______________________ ______________________________________________________________________ |
| / ______________________ / / _______ / ______________________ |
| / / _______ / / 20 5*\/ 10951 / / _______ |
| / 16 / 20 5*\/ 10951 10 / 27*3 / - ---- + ----------- / 16 / 20 5*\/ 10951 10 |
| / --- + 2*3 / - ---- + ----------- - ------------------------------ / \/ 6561 6561 19683* / --- + 2*3 / - ---- + ----------- - ------------------------------ |
| / 729 \/ 6561 6561 ______________________ / / 729 \/ 6561 6561 ______________________ |
| / / _______ / / / _______ |
| / / 20 5*\/ 10951 / / / 20 5*\/ 10951 |
| / 27*3 / - ---- + ----------- / / 27*3 / - ---- + ----------- |
|2 \/ \/ 6561 6561 \/ \/ \/ 6561 6561 |
5 + 3*|-- + -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
\27 2 2 / Intervalos de crecimiento y decrecimiento de la función: Hallemos los intervalos donde la función crece y decrece y también los puntos mínimos y máximos de la función, para lo cual miramos cómo se comporta la función en los extremos con desviación mínima del extremo:
Puntos mínimos de la función:
x 1 = − ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 + − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 x_{1} = - \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2} + \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} x 1 = − 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 + 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 Puntos máximos de la función:
x 1 = − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 + ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 x_{1} = \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} + \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2} x 1 = 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 + 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 Decrece en los intervalos
[ − ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 + − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 , − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 + ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 ] \left[- \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2} + \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27}, \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} + \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2}\right] − 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 + 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 , 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 + 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 Crece en los intervalos
( − ∞ , − ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 + − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 ] ∪ [ − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 2 + 2 27 + ∣ − 2 − 20 6561 + 5 10951 6561 3 + 32 729 + 10 27 − 20 6561 + 5 10951 6561 3 + 128 19683 − 10 27 − 20 6561 + 5 10951 6561 3 + 16 729 + 2 − 20 6561 + 5 10951 6561 3 ∣ 2 , ∞ ) \left(-\infty, - \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2} + \frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27}\right] \cup \left[\frac{\sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}{2} + \frac{2}{27} + \frac{\sqrt{\left|{- 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}} + \frac{32}{729} + \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{128}{19683 \sqrt{- \frac{10}{27 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}} + \frac{16}{729} + 2 \sqrt[3]{- \frac{20}{6561} + \frac{5 \sqrt{10951}}{6561}}}}}\right|}}{2}, \infty\right) − ∞ , − 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 + 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 ∪ 2 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 + 27 2 + 2 − 2 3 − 6561 20 + 6561 5 10951 + 729 32 + 27 3 − 6561 20 + 6561 5 10951 10 + 19683 − 27 3 − 6561 20 + 6561 5 10951 10 + 729 16 + 2 3 − 6561 20 + 6561 5 10951 128 , ∞