El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\sqrt{\left(2 x + 3\right)^{3}} e^{- x} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = 63.791046208665$$
$$x_{2} = 51.977917418658$$
$$x_{3} = 44.1846070578397$$
$$x_{4} = 97.5486131941183$$
$$x_{5} = 75.6756444193769$$
$$x_{6} = 119.473656679255$$
$$x_{7} = 34.4257331436488$$
$$x_{8} = 89.5864345668301$$
$$x_{9} = 40.3358270949082$$
$$x_{10} = 65.7681780356844$$
$$x_{11} = 83.6203711165116$$
$$x_{12} = 59.8426477418814$$
$$x_{13} = 113.490876041761$$
$$x_{14} = -1.50000000004723$$
$$x_{15} = 111.497077261603$$
$$x_{16} = 55.9039215568408$$
$$x_{17} = 71.708892726077$$
$$x_{18} = 77.6605532164086$$
$$x_{19} = 73.6917239030971$$
$$x_{20} = 67.7469771523196$$
$$x_{21} = 50.0210159806595$$
$$x_{22} = 109.503532916145$$
$$x_{23} = 79.6463614264492$$
$$x_{24} = 93.5665938245543$$
$$x_{25} = 81.6329905790302$$
$$x_{26} = 95.5573877939381$$
$$x_{27} = 101.532242062767$$
$$x_{28} = 87.5971454643819$$
$$x_{29} = 99.5402402997044$$
$$x_{30} = 85.6084411580172$$
$$x_{31} = 105.517273021307$$
$$x_{32} = 53.9390903341121$$
$$x_{33} = 117.479178897929$$
$$x_{34} = 69.7272663184576$$
$$x_{35} = 46.1232694738407$$
$$x_{36} = 91.5762640298328$$
$$x_{37} = 121.468336106747$$
$$x_{38} = 57.8719112786737$$
$$x_{39} = 115.484914473072$$
$$x_{40} = 42.2547536287917$$
$$x_{41} = 34.6800163461302$$
$$x_{42} = 36.5434699093467$$
$$x_{43} = 38.4307138703711$$
$$x_{44} = 103.524593817163$$
$$x_{45} = 107.510259033655$$
$$x_{46} = 61.8157884816431$$
$$x_{47} = 48.0691473072523$$