El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{- \frac{x}{4}} x = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
Solución numérica$$x_{1} = 144.106451914649$$
$$x_{2} = 171.133506160009$$
$$x_{3} = 0$$
$$x_{4} = 151.764239220227$$
$$x_{5} = 140.305664837211$$
$$x_{6} = 136.52828514286$$
$$x_{7} = 157.54662459814$$
$$x_{8} = 155.61596255354$$
$$x_{9} = 178.942064282917$$
$$x_{10} = 163.35538611473$$
$$x_{11} = 182.855813029775$$
$$x_{12} = 180.898217564474$$
$$x_{13} = 147.926951707089$$
$$x_{14} = 142.203384233432$$
$$x_{15} = 173.083058525846$$
$$x_{16} = 184.814778790637$$
$$x_{17} = 134.649806317294$$
$$x_{18} = 149.843655580279$$
$$x_{19} = 169.185845498517$$
$$x_{20} = 161.416516010677$$
$$x_{21} = 138.413781035978$$
$$x_{22} = 176.987430340767$$
$$x_{23} = 146.014435920424$$
$$x_{24} = 186.77504777445$$
$$x_{25} = 217.838670340738$$
$$x_{26} = 130.916892348163$$
$$x_{27} = 175.034398666226$$
$$x_{28} = 153.688425088829$$
$$x_{29} = 129.064251140936$$
$$x_{30} = 132.779065223278$$
$$x_{31} = 159.480205017069$$
$$x_{32} = 167.240188968628$$
$$x_{33} = 165.296658410119$$