El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$- \frac{x e^{- x}}{2} + \frac{\left(-1\right) 3 e^{- x}}{4} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{3}{2}$$
Solución numérica$$x_{1} = 57.637784073419$$
$$x_{2} = 119.375505648528$$
$$x_{3} = 101.414222689675$$
$$x_{4} = 73.5193694768631$$
$$x_{5} = 117.379157346376$$
$$x_{6} = 91.4432816340678$$
$$x_{7} = 71.5306688772627$$
$$x_{8} = 67.5557206465541$$
$$x_{9} = 32.2753405999167$$
$$x_{10} = 87.4570558146216$$
$$x_{11} = 51.7072852196874$$
$$x_{12} = 30.4161165142849$$
$$x_{13} = 111.390989797501$$
$$x_{14} = 36.0764955793778$$
$$x_{15} = 47.7670130042526$$
$$x_{16} = 93.4369007181773$$
$$x_{17} = 63.5846875888596$$
$$x_{18} = 97.4250325753519$$
$$x_{19} = 109.395256361677$$
$$x_{20} = 99.4195044310966$$
$$x_{21} = 107.399700999279$$
$$x_{22} = 55.6587829478829$$
$$x_{23} = 59.6185776773197$$
$$x_{24} = 49.7355110487586$$
$$x_{25} = 75.508783646098$$
$$x_{26} = 61.6009411352544$$
$$x_{27} = 85.4645043516945$$
$$x_{28} = 65.5696589767077$$
$$x_{29} = 38.0030681547456$$
$$x_{30} = 45.8024119845991$$
$$x_{31} = 113.386890787263$$
$$x_{32} = 69.5427571425938$$
$$x_{33} = 83.472369233644$$
$$x_{34} = 81.480686577935$$
$$x_{35} = 77.498845436227$$
$$x_{36} = 34.1653082318707$$
$$x_{37} = 41.8883113518155$$
$$x_{38} = 39.9412122741506$$
$$x_{39} = -1.5$$
$$x_{40} = 121.371986840132$$
$$x_{41} = 79.4894968300781$$
$$x_{42} = 105.404335132042$$
$$x_{43} = 95.4308248466663$$
$$x_{44} = 53.6818418187569$$
$$x_{45} = 89.4499912665964$$
$$x_{46} = 103.409171183117$$
$$x_{47} = 115.382949626132$$
$$x_{48} = 43.8425010320637$$