Para hallar los extremos hay que resolver la ecuación
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(la derivada es igual a cero),
y las raíces de esta ecuación serán los extremos de esta función:
$$\frac{d}{d x} f{\left(x \right)} = $$
primera derivada$$\frac{3}{\left(x - 1\right)^{4}} - \frac{2}{x x^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8} + \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2}$$
$$x_{2} = - \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2} + \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8}$$
Signos de extremos en los puntos:
____________________________________________________________________________________________________________________
/ ______________
/ / _____
/ 57 1 / 9 \/ 593 531
/ -- + ------------------- - 2*3 / -- + ------- + ---------------------------------------------------------------
__________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________
/ ______________ / / _____ / ______________
/ / _____ / / 9 \/ 593 / / _____
/ 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593
/ -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + -------
/ 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64
/ / _____ / / / _____
/ / 9 \/ 593 / / / 9 \/ 593
/ 3 / -- + ------- / / 3 / -- + -------
11 \/ \/ 64 64 \/ \/ \/ 64 64 1 1
(-- + ------------------------------------------------------------ + -----------------------------------------------------------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
8 2 2 2 3
/ ____________________________________________________________________________________________________________________\ / ____________________________________________________________________________________________________________________\
| / ______________ | | / ______________ |
| / / _____ | | / / _____ |
| / 57 1 / 9 \/ 593 531 | | / 57 1 / 9 \/ 593 531 |
| / -- + ------------------- - 2*3 / -- + ------- + --------------------------------------------------------------- | | / -- + ------------------- - 2*3 / -- + ------- + --------------------------------------------------------------- |
| __________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________ | | __________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________ |
| / ______________ / / _____ / ______________ | | / ______________ / / _____ / ______________ |
| / / _____ / / 9 \/ 593 / / _____ | | / / _____ / / 9 \/ 593 / / _____ |
| / 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593 | | / 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593 |
| / -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + ------- | | / -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + ------- |
| / 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64 | | / 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64 |
| / / _____ / / / _____ | | / / _____ / / / _____ |
| / / 9 \/ 593 / / / 9 \/ 593 | | / / 9 \/ 593 / / / 9 \/ 593 |
| / 3 / -- + ------- / / 3 / -- + ------- | | / 3 / -- + ------- / / 3 / -- + ------- |
|11 \/ \/ 64 64 \/ \/ \/ 64 64 | |3 \/ \/ 64 64 \/ \/ \/ 64 64 |
|-- + ------------------------------------------------------------ + -----------------------------------------------------------------------------------------------------------------------------------| |- + ------------------------------------------------------------ + -----------------------------------------------------------------------------------------------------------------------------------|
\8 2 2 / \8 2 2 /
____________________________________________________________________________________________________________________
/ ______________
/ / _____
/ 57 1 / 9 \/ 593 531
/ -- + ------------------- - 2*3 / -- + ------- + ---------------------------------------------------------------
__________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________
/ ______________ / / _____ / ______________
/ / _____ / / 9 \/ 593 / / _____
/ 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593
/ -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + -------
/ 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64
/ / _____ / / / _____
/ / 9 \/ 593 / / / 9 \/ 593
/ 3 / -- + ------- / / 3 / -- + -------
11 \/ \/ 64 64 \/ \/ \/ 64 64 1 1
(-- + ------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------, ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
8 2 2 2 3
/ ____________________________________________________________________________________________________________________\ / ____________________________________________________________________________________________________________________\
| / ______________ | | / ______________ |
| / / _____ | | / / _____ |
| / 57 1 / 9 \/ 593 531 | | / 57 1 / 9 \/ 593 531 |
| / -- + ------------------- - 2*3 / -- + ------- + --------------------------------------------------------------- | | / -- + ------------------- - 2*3 / -- + ------- + --------------------------------------------------------------- |
| __________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________ | | __________________________________________________ / 8 ______________ \/ 64 64 __________________________________________________ |
| / ______________ / / _____ / ______________ | | / ______________ / / _____ / ______________ |
| / / _____ / / 9 \/ 593 / / _____ | | / / _____ / / 9 \/ 593 / / _____ |
| / 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593 | | / 57 1 / 9 \/ 593 / 3 / -- + ------- / 57 1 / 9 \/ 593 |
| / -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + ------- | | / -- - ------------------- + 2*3 / -- + ------- / \/ 64 64 32* / -- - ------------------- + 2*3 / -- + ------- |
| / 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64 | | / 16 ______________ \/ 64 64 / / 16 ______________ \/ 64 64 |
| / / _____ / / / _____ | | / / _____ / / / _____ |
| / / 9 \/ 593 / / / 9 \/ 593 | | / / 9 \/ 593 / / / 9 \/ 593 |
| / 3 / -- + ------- / / 3 / -- + ------- | | / 3 / -- + ------- / / 3 / -- + ------- |
|11 \/ \/ 64 64 \/ \/ \/ 64 64 | |3 \/ \/ 64 64 \/ \/ \/ 64 64 |
|-- + ------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------| |- + ------------------------------------------------------------ - -----------------------------------------------------------------------------------------------------------------------------------|
\8 2 2 / \8 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:
$$x_{1} = - \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2} + \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8}$$
Puntos máximos de la función:
$$x_{1} = \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8} + \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2}$$
Decrece en los intervalos
$$\left[- \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2} + \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8}, \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8} + \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2}\right]$$
Crece en los intervalos
$$\left(-\infty, - \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2} + \frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8}\right] \cup \left[\frac{\sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}{2} + \frac{11}{8} + \frac{\sqrt{- 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + \frac{57}{8} + \frac{531}{32 \sqrt{- \frac{1}{\sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}}} + 2 \sqrt[3]{\frac{9}{64} + \frac{\sqrt{593}}{64}} + \frac{57}{16}}}}}{2}, \infty\right)$$