El gráfico de la función cruce el eje T con f = 0
o sea hay que resolver la ecuación:
$$e^{- t} t = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje T:
Solución analítica$$t_{1} = 0$$
Solución numérica$$t_{1} = 101.418161552262$$
$$t_{2} = 57.6533514231885$$
$$t_{3} = 47.7931569932505$$
$$t_{4} = 77.5062407712727$$
$$t_{5} = 121.374613775997$$
$$t_{6} = 39.9866376954424$$
$$t_{7} = 97.429350983852$$
$$t_{8} = 41.9272307499711$$
$$t_{9} = 59.6328238138969$$
$$t_{10} = 105.407942520376$$
$$t_{11} = 103.412938828373$$
$$t_{12} = 45.8319875396224$$
$$t_{13} = 69.5523925194344$$
$$t_{14} = 38.0568716419232$$
$$t_{15} = 63.5967547129854$$
$$t_{16} = 67.5660769899711$$
$$t_{17} = 51.7281686335153$$
$$t_{18} = 115.385891060967$$
$$t_{19} = 53.7006804984823$$
$$t_{20} = 81.4872456640903$$
$$t_{21} = 93.4416565533312$$
$$t_{22} = 79.496455118891$$
$$t_{23} = 0$$
$$t_{24} = 95.4353540260187$$
$$t_{25} = 107.40315817241$$
$$t_{26} = 73.5277731870455$$
$$t_{27} = 83.4785626915261$$
$$t_{28} = 91.4482816547886$$
$$t_{29} = 49.758798960419$$
$$t_{30} = 61.614029218278$$
$$t_{31} = 55.67586733869$$
$$t_{32} = 87.4626045093137$$
$$t_{33} = 65.580821222158$$
$$t_{34} = 85.4703620749206$$
$$t_{35} = 119.378231552779$$
$$t_{36} = 36.1413894508705$$
$$t_{37} = 71.5396566043977$$
$$t_{38} = 34.2454094695441$$
$$t_{39} = 113.389949729147$$
$$t_{40} = 89.4552548670559$$
$$t_{41} = 32.3772961851972$$
$$t_{42} = 109.398572537176$$
$$t_{43} = 99.4236264980399$$
$$t_{44} = 75.5166588459953$$
$$t_{45} = 111.394173451874$$
$$t_{46} = 43.8762545098096$$
$$t_{47} = 117.381987933686$$