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$$\frac{- 2 x - 2}{\left(\left(\left(x^{2} + 2 x\right) - 8\right) - 4\right)^{2}} + \frac{2}{\left(\left(2 x - 3\right) - 5\right)^{2}} = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = - \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}$$
$$x_{2} = \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}$$
Signos de extremos en los puntos:
_________________________________________________________ _______________________________________________________________________________________________________________________________
/ ________________ / ________________
/ / ______ / / ______
/ 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32 1 1
( / - - + 2*3 / --- + -------- + ----------------------- - / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - -----------------------, -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
/ 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________ 2 _______________________________________________________________________________________________________________________________ _________________________________________________________
/ / ______ / / ________________ / ______ / _________________________________________________________ _______________________________________________________________________________________________________________________________\ _______________________________________________________________________________________________________________________________ _________________________________________________________ / ________________ / ________________
/ / 499 \/ 2265 / / / ______ / 499 \/ 2265 | / ________________ / ________________ | / ________________ / ________________ / / ______ / / ______
/ 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + -------- | / / ______ / / ______ | / / ______ / / ______ / 8 / 499 \/ 2265 20 32 / 4 / 499 \/ 2265 32
\/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 | / 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32 | / 8 / 499 \/ 2265 20 32 / 4 / 499 \/ 2265 32 -8 - 2* / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - ----------------------- + 2* / - - + 2*3 / --- + -------- + -----------------------
/ / 3 \/ 108 12 ________________ -12 + | / - - + 2*3 / --- + -------- + ----------------------- - / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - ----------------------- | - 2* / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - ----------------------- + 2* / - - + 2*3 / --- + -------- + ----------------------- / 3 \/ 108 12 _________________________________________________________ ________________ / 3 \/ 108 12 ________________
/ / / ______ | / 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________ | / 3 \/ 108 12 _________________________________________________________ ________________ / 3 \/ 108 12 ________________ / / ________________ / ______ / / ______
/ / / 499 \/ 2265 | / / ______ / / ________________ / ______ | / / ________________ / ______ / / ______ / / / ______ / 499 \/ 2265 / / 499 \/ 2265
/ / 9*3 / --- + -------- | / / 499 \/ 2265 / / / ______ / 499 \/ 2265 | / / / ______ / 499 \/ 2265 / / 499 \/ 2265 / / 4 / 499 \/ 2265 32 9*3 / --- + -------- / 9*3 / --- + --------
\/ \/ \/ 108 12 | / 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + -------- | / / 4 / 499 \/ 2265 32 9*3 / --- + -------- / 9*3 / --- + -------- / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 \/ \/ 108 12
|\/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 | / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 \/ \/ 108 12 / / 3 \/ 108 12 ________________
| / / 3 \/ 108 12 ________________ | / / 3 \/ 108 12 ________________ / / / ______
| / / / ______ | / / / ______ / / / 499 \/ 2265
| / / / 499 \/ 2265 | / / / 499 \/ 2265 / / 9*3 / --- + --------
| / / 9*3 / --- + -------- | / / 9*3 / --- + -------- \/ \/ \/ 108 12
\ \/ \/ \/ 108 12 / \/ \/ \/ 108 12
_________________________________________________________ _______________________________________________________________________________________________________________________________
/ ________________ / ________________
/ / ______ / / ______
/ 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32 1 1
( / - - + 2*3 / --- + -------- + ----------------------- + / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - -----------------------, -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------)
/ 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________ 2 _________________________________________________________ _______________________________________________________________________________________________________________________________
/ / ______ / / ________________ / ______ / _________________________________________________________ _______________________________________________________________________________________________________________________________\ _________________________________________________________ _______________________________________________________________________________________________________________________________ / ________________ / ________________
/ / 499 \/ 2265 / / / ______ / 499 \/ 2265 | / ________________ / ________________ | / ________________ / ________________ / / ______ / / ______
/ 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + -------- | / / ______ / / ______ | / / ______ / / ______ / 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32
\/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 | / 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32 | / 4 / 499 \/ 2265 32 / 8 / 499 \/ 2265 20 32 -8 + 2* / - - + 2*3 / --- + -------- + ----------------------- + 2* / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - -----------------------
/ / 3 \/ 108 12 ________________ -12 + | / - - + 2*3 / --- + -------- + ----------------------- + / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - ----------------------- | + 2* / - - + 2*3 / --- + -------- + ----------------------- + 2* / - - - 2*3 / --- + -------- + ------------------------------------------------------------------- - ----------------------- / 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________
/ / / ______ | / 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________ | / 3 \/ 108 12 ________________ / 3 \/ 108 12 _________________________________________________________ ________________ / / ______ / / ________________ / ______
/ / / 499 \/ 2265 | / / ______ / / ________________ / ______ | / / ______ / / ________________ / ______ / / 499 \/ 2265 / / / ______ / 499 \/ 2265
/ / 9*3 / --- + -------- | / / 499 \/ 2265 / / / ______ / 499 \/ 2265 | / / 499 \/ 2265 / / / ______ / 499 \/ 2265 / 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + --------
\/ \/ \/ 108 12 | / 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + -------- | / 9*3 / --- + -------- / / 4 / 499 \/ 2265 32 9*3 / --- + -------- \/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12
|\/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 | \/ \/ 108 12 / / - - + 2*3 / --- + -------- + ----------------------- \/ 108 12 / / 3 \/ 108 12 ________________
| / / 3 \/ 108 12 ________________ | / / 3 \/ 108 12 ________________ / / / ______
| / / / ______ | / / / ______ / / / 499 \/ 2265
| / / / 499 \/ 2265 | / / / 499 \/ 2265 / / 9*3 / --- + --------
| / / 9*3 / --- + -------- | / / 9*3 / --- + -------- \/ \/ \/ 108 12
\ \/ \/ \/ 108 12 / \/ \/ \/ 108 12
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:
$$x_{1} = \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}$$
Puntos máximos de la función:
$$x_{1} = - \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}$$
Decrece en los intervalos
$$\left(-\infty, - \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}\right] \cup \left[\sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}, \infty\right)$$
Crece en los intervalos
$$\left[- \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}, \sqrt{- 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}} - \frac{8}{3} - \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + \frac{20}{\sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}}} + \sqrt{- \frac{4}{3} + \frac{32}{9 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}} + 2 \sqrt[3]{\frac{\sqrt{2265}}{12} + \frac{499}{108}}}\right]$$