El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{- x} \left(2 x + 1\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{1}{2}$$
Solución numérica$$x_{1} = 53.6942425313464$$
$$x_{2} = -0.5$$
$$x_{3} = 95.4338260411592$$
$$x_{4} = 73.5249255125242$$
$$x_{5} = 113.388919972831$$
$$x_{6} = 83.4764689289016$$
$$x_{7} = 99.4222366337062$$
$$x_{8} = 38.03813223288$$
$$x_{9} = 32.3410675911745$$
$$x_{10} = 119.377314419049$$
$$x_{11} = 36.1186751093219$$
$$x_{12} = 81.485027376049$$
$$x_{13} = 39.9708789291397$$
$$x_{14} = 79.4941007822398$$
$$x_{15} = 43.8646148590397$$
$$x_{16} = 103.411669111484$$
$$x_{17} = 77.5037373857908$$
$$x_{18} = 59.6279716625789$$
$$x_{19} = 105.406727099247$$
$$x_{20} = 91.446593786356$$
$$x_{21} = 57.6480439081171$$
$$x_{22} = 93.4400516215572$$
$$x_{23} = 41.9137729445093$$
$$x_{24} = 87.4607301444495$$
$$x_{25} = 117.381035409709$$
$$x_{26} = 121.373730091751$$
$$x_{27} = 55.6700361039548$$
$$x_{28} = 69.5491236034661$$
$$x_{29} = 111.393101497946$$
$$x_{30} = 61.6095756008659$$
$$x_{31} = 67.5625611495487$$
$$x_{32} = 109.397455729689$$
$$x_{33} = 34.2171921723654$$
$$x_{34} = 47.784180482594$$
$$x_{35} = 107.401993627038$$
$$x_{36} = 75.5139916881833$$
$$x_{37} = 49.7508171320252$$
$$x_{38} = 89.4534774309093$$
$$x_{39} = 63.5926519716461$$
$$x_{40} = 51.7210220352017$$
$$x_{41} = 101.416833804928$$
$$x_{42} = 85.4683825865519$$
$$x_{43} = 45.8218123455453$$
$$x_{44} = 97.4278945214929$$
$$x_{45} = 65.5770290761259$$
$$x_{46} = 115.384901052472$$
$$x_{47} = 71.5366092859139$$