El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\frac{\frac{1}{\left(x - 3\right) \left(x - 1\right)} \left(4 - 2 x\right)}{\left(x - 3\right) \left(x - 1\right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 2$$
Solución numérica$$x_{1} = -30441.7087818787$$
$$x_{2} = -25355.1956280906$$
$$x_{3} = 24642.6697943983$$
$$x_{4} = -13484.0629303382$$
$$x_{5} = 19555.622232257$$
$$x_{6} = -14332.2574401388$$
$$x_{7} = 30576.9607286225$$
$$x_{8} = -21116.1081408212$$
$$x_{9} = 15315.6947073257$$
$$x_{10} = -35527.96782414$$
$$x_{11} = 32272.4007511367$$
$$x_{12} = 38206.2790179564$$
$$x_{13} = -23659.6064602865$$
$$x_{14} = 13619.3916429577$$
$$x_{15} = 37358.5947362375$$
$$x_{16} = -12635.7892988554$$
$$x_{17} = -38071.0338727658$$
$$x_{18} = 18707.7058128052$$
$$x_{19} = -37223.3490351873$$
$$x_{20} = -40614.0682023929$$
$$x_{21} = -36375.6604419003$$
$$x_{22} = -39766.3932412975$$
$$x_{23} = -22811.7906651013$$
$$x_{24} = -32137.1507408333$$
$$x_{25} = 39901.6373793217$$
$$x_{26} = 23794.8707458989$$
$$x_{27} = 41596.9835238138$$
$$x_{28} = -16028.4592776001$$
$$x_{29} = -32984.8627220526$$
$$x_{30} = 26338.230277608$$
$$x_{31} = 22947.0573071609$$
$$x_{32} = -19420.3428903681$$
$$x_{33} = 27185.9940576599$$
$$x_{34} = 14467.575228032$$
$$x_{35} = -38918.7151999899$$
$$x_{36} = 29729.2308152591$$
$$x_{37} = 25490.4558880833$$
$$x_{38} = 31424.6838625292$$
$$x_{39} = 35663.2147583842$$
$$x_{40} = -41461.7402721613$$
$$x_{41} = 11922.7774961659$$
$$x_{42} = -11787.4194932989$$
$$x_{43} = 28881.4935255786$$
$$x_{44} = -26202.9717446159$$
$$x_{45} = 40749.3118833833$$
$$x_{46} = -34680.2708868702$$
$$x_{47} = 17011.7796699387$$
$$x_{48} = -29593.9777734643$$
$$x_{49} = -43157.0764190717$$
$$x_{50} = 33967.8176625065$$
$$x_{51} = -17724.4711883433$$
$$x_{52} = -42309.4096243535$$
$$x_{53} = -33832.5693054934$$
$$x_{54} = 2$$
$$x_{55} = -27898.492652453$$
$$x_{56} = -21963.9585469319$$
$$x_{57} = 39053.9598251782$$
$$x_{58} = 22099.2278225587$$
$$x_{59} = 33120.1118739225$$
$$x_{60} = -24507.4076256731$$
$$x_{61} = -28746.239290691$$
$$x_{62} = 16163.7601634659$$
$$x_{63} = 20403.5127178497$$
$$x_{64} = 17859.7597678008$$
$$x_{65} = 21251.3803723555$$
$$x_{66} = -18572.4221668727$$
$$x_{67} = -15180.3860741083$$
$$x_{68} = 36510.9067380414$$
$$x_{69} = -31289.43292325$$
$$x_{70} = 34815.5185064768$$
$$x_{71} = -27050.737092296$$
$$x_{72} = 12771.1311938499$$
$$x_{73} = -16876.4853984547$$
$$x_{74} = 28033.748190538$$
$$x_{75} = -20268.2371532321$$