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$$\left(\frac{x + 1}{2 x - 1}\right)^{x} \left(\frac{x \left(2 x - 1\right) \left(- \frac{2 \left(x + 1\right)}{\left(2 x - 1\right)^{2}} + \frac{1}{2 x - 1}\right)}{x + 1} + \log{\left(\frac{x + 1}{2 x - 1} \right)}\right) = 0$$
Resolvermos esta ecuaciónRaíces de esta ecuación
$$x_{1} = 78.4909928314846$$
$$x_{2} = 128.487815526633$$
$$x_{3} = 112.48830587262$$
$$x_{4} = 114.48823081463$$
$$x_{5} = 120.488031723741$$
$$x_{6} = 106.488562914107$$
$$x_{7} = 74.4916787095585$$
$$x_{8} = 58.4970311808328$$
$$x_{9} = 124.487917476664$$
$$x_{10} = 118.48809409066$$
$$x_{11} = 52.5015859524306$$
$$x_{12} = 86.4899783694111$$
$$x_{13} = 116.488160343558$$
$$x_{14} = 54.4997712773588$$
$$x_{15} = 42.5217350910816$$
$$x_{16} = 56.4982775703649$$
$$x_{17} = 66.4936388270172$$
$$x_{18} = 104.488660930511$$
$$x_{19} = 92.4894290548019$$
$$x_{20} = 90.489596591564$$
$$x_{21} = 126.487865079088$$
$$x_{22} = 46.5102782564629$$
$$x_{23} = 62.4950813502932$$
$$x_{24} = 44.5150972769133$$
$$x_{25} = 70.4925386396084$$
$$x_{26} = 76.491317193376$$
$$x_{27} = 98.4890010939741$$
$$x_{28} = 72.4920834126443$$
$$x_{29} = 48.5066457313568$$
$$x_{30} = 122.487972942868$$
$$x_{31} = 100.488879245506$$
$$x_{32} = 102.488766131894$$
$$x_{33} = 82.4904363941597$$
$$x_{34} = 108.488471437747$$
$$x_{35} = 50.5038262641685$$
$$x_{36} = 68.4930533930123$$
$$x_{37} = 84.4901966327898$$
$$x_{38} = 60.4959788878618$$
$$x_{39} = 110.4883859278$$
$$x_{40} = 94.4892748594052$$
$$x_{41} = 64.4943089109692$$
$$x_{42} = 80.4907006235634$$
$$x_{43} = -1.5769193563577$$
$$x_{44} = 130.487768615883$$
$$x_{45} = 88.4897790765283$$
$$x_{46} = 96.4891326108787$$
Signos de extremos en los puntos:
(78.49099283148459, 1.05014634346105e-23)
(128.48781552663283, 9.36477770172146e-39)
(112.4883058726204, 6.13271093478345e-34)
(114.48823081462974, 1.53334523071786e-34)
(120.48803172374079, 2.39656682358129e-36)
(106.48856291410704, 3.92351212097174e-32)
(74.49167870955849, 1.67901594213546e-22)
(58.49703118083283, 1.09482244528553e-17)
(124.48791747666395, 1.4981202637301e-37)
(118.48809409066045, 9.58535770084247e-36)
(52.50158595243062, 6.97984717665841e-16)
(86.48997836941109, 4.10679029620736e-26)
(116.48816034355843, 3.83376220925777e-35)
(54.49977127735879, 1.74759883463734e-16)
(42.52173509108155, 7.03692167546217e-13)
(56.49827757036489, 4.37454977332933e-17)
(66.49363882701724, 4.28991951827825e-20)
(104.48866093051102, 1.56919444569848e-31)
(92.48942905480189, 6.42106922434544e-28)
(90.48959659156404, 2.56790431343069e-27)
(126.48786507908787, 3.74561226241293e-38)
(46.510278256462925, 4.4363474658769e-14)
(62.49508135029324, 6.85461347843343e-19)
(44.51509727691328, 1.76800990576483e-13)
(70.49253863960843, 2.68407895727006e-21)
(76.49131719337599, 4.19912993910605e-23)
(98.48900109397407, 1.00383248216796e-29)
(72.49208341264426, 6.71327284364859e-22)
(48.50664573135677, 1.11223670414643e-14)
(122.48797294286774, 5.99196068969012e-37)
(100.48887924550584, 2.50997957083157e-30)
(102.48876613189415, 6.27588899085674e-31)
(82.49043639415972, 6.56743029975234e-25)
(108.48847143774695, 9.81002732764053e-33)
(50.503826264168545, 2.78684927704995e-15)
(68.49305339301229, 1.07308665493174e-20)
(84.49019663278976, 1.64230296853545e-25)
(60.49597888786176, 2.73961427704645e-18)
(110.48838592779981, 2.45280287781477e-33)
(94.4892748594052, 1.60557374123156e-28)
(64.49430891096922, 1.71488017503667e-19)
(80.49070062356336, 2.62620160864513e-24)
(-1.5769193563577026, 22.4878221663397)
(130.48776861588257, 2.34137367921008e-39)
(88.48977907652834, 1.02693775457712e-26)
(96.48913261087871, 4.01465351063248e-29)
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:
$$x_{1} = -1.5769193563577$$
La función no tiene puntos máximos
Decrece en los intervalos
$$\left[-1.5769193563577, \infty\right)$$
Crece en los intervalos
$$\left(-\infty, -1.5769193563577\right]$$