El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$2 x e^{- x} + - x^{2} e^{- x} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
$$x_{2} = 2$$
Solución numérica$$x_{1} = 62.0805571210015$$
$$x_{2} = 121.574503449427$$
$$x_{3} = 107.633771438231$$
$$x_{4} = 44.6582150315442$$
$$x_{5} = 37.2695206513987$$
$$x_{6} = 109.624230413862$$
$$x_{7} = 87.7581351198125$$
$$x_{8} = 46.558930992648$$
$$x_{9} = 85.774456655146$$
$$x_{10} = 113.606309881405$$
$$x_{11} = 101.665040427108$$
$$x_{12} = 64.0433676432483$$
$$x_{13} = 103.654146483763$$
$$x_{14} = 115.597884083738$$
$$x_{15} = 50.3963836086947$$
$$x_{16} = 105.643733917975$$
$$x_{17} = 56.2145487691854$$
$$x_{18} = 119.581999032425$$
$$x_{19} = 52.3289362867604$$
$$x_{20} = 111.615084597457$$
$$x_{21} = 42.7734798936756$$
$$x_{22} = 48.4724450240127$$
$$x_{23} = 81.8100523902503$$
$$x_{24} = 97.6884128679652$$
$$x_{25} = 75.8723044353069$$
$$x_{26} = 67.9775817816825$$
$$x_{27} = 2$$
$$x_{28} = 35.518234582377$$
$$x_{29} = 91.7280565000326$$
$$x_{30} = 40.9091112925386$$
$$x_{31} = 39.0713592767794$$
$$x_{32} = 83.7917334746358$$
$$x_{33} = 77.8502200597028$$
$$x_{34} = 73.8959068817062$$
$$x_{35} = 69.9483432722062$$
$$x_{36} = 89.7426914756113$$
$$x_{37} = 93.7141680867988$$
$$x_{38} = 71.9211906076499$$
$$x_{39} = 95.7009703512766$$
$$x_{40} = 117.589786759242$$
$$x_{41} = 54.2686954792205$$
$$x_{42} = 58.165604409395$$
$$x_{43} = 79.8295111187539$$
$$x_{44} = 66.0091582728753$$
$$x_{45} = 0$$
$$x_{46} = 99.6764500177863$$
$$x_{47} = 60.1211385583235$$