El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\left(- x - 1\right) e^{\frac{\left(-1\right) x}{2}} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = -1$$
Solución numérica$$x_{1} = 83.6700090496785$$
$$x_{2} = 89.5266081982603$$
$$x_{3} = 72.0828388229057$$
$$x_{4} = 99.342276675018$$
$$x_{5} = 119.095528794683$$
$$x_{6} = 73.9977856856351$$
$$x_{7} = 77.8498123215881$$
$$x_{8} = 121.076670714823$$
$$x_{9} = 113.157391879098$$
$$x_{10} = 91.4849999225423$$
$$x_{11} = 123.05860078146$$
$$x_{12} = 142.912185175485$$
$$x_{13} = 93.4459898490383$$
$$x_{14} = 75.9204606220094$$
$$x_{15} = -1$$
$$x_{16} = 103.282405900264$$
$$x_{17} = 136.950525814337$$
$$x_{18} = 79.7849784014831$$
$$x_{19} = 101.311518404363$$
$$x_{20} = 125.041270043143$$
$$x_{21} = 81.7252436386911$$
$$x_{22} = 127.024633562895$$
$$x_{23} = 109.203700291657$$
$$x_{24} = 111.179990094763$$
$$x_{25} = 64.5319546641865$$
$$x_{26} = -1$$
$$x_{27} = 105.254808190712$$
$$x_{28} = 140.924518161013$$
$$x_{29} = 130.993281306215$$
$$x_{30} = 68.2816476432738$$
$$x_{31} = 70.1769177772242$$
$$x_{32} = 87.5710914786596$$
$$x_{33} = 97.3748275708288$$
$$x_{34} = 85.6187686124494$$
$$x_{35} = 66.3990976386125$$
$$x_{36} = 138.937290339872$$
$$x_{37} = 95.4093363753611$$
$$x_{38} = 132.978492300793$$
$$x_{39} = 129.008650010896$$
$$x_{40} = 107.22860806612$$
$$x_{41} = 115.135828125928$$
$$x_{42} = 134.964250499918$$
$$x_{43} = 117.115228451463$$