El gráfico de la función cruce el eje T con f = 0
o sea hay que resolver la ecuación:
$$e^{- \frac{t}{4} + 1} \sqrt{t} \left(t + 4\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje T:
Solución analítica$$t_{1} = -4$$
$$t_{2} = 0$$
Solución numérica$$t_{1} = 178.317983755953$$
$$t_{2} = 168.687281597235$$
$$t_{3} = 174.457855744876$$
$$t_{4} = 153.448623743146$$
$$t_{5} = 170.607992325362$$
$$t_{6} = 147.809909814181$$
$$t_{7} = -4$$
$$t_{8} = 151.563461344664$$
$$t_{9} = 186.064996277466$$
$$t_{10} = 164.855153862676$$
$$t_{11} = 0$$
$$t_{12} = 145.942405167009$$
$$t_{13} = 182.187331973507$$
$$t_{14} = 172.531569457664$$
$$t_{15} = 157.233824422202$$
$$t_{16} = 144.081755187505$$
$$t_{17} = 176.386705547174$$
$$t_{18} = 162.944121189179$$
$$t_{19} = 149.683750354425$$
$$t_{20} = 184.125176312965$$
$$t_{21} = 155.338859064521$$
$$t_{22} = 261.428018316045$$
$$t_{23} = 180.251564836171$$
$$t_{24} = 159.133208301074$$
$$t_{25} = 166.769607349294$$
$$t_{26} = 161.036726935138$$
$$t_{27} = 188.006696956634$$