El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{3 x} \left(2 x + 1\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = - \frac{1}{2}$$
Solución numérica$$x_{1} = -30.9564103308696$$
$$x_{2} = -74.9007826008835$$
$$x_{3} = -0.5$$
$$x_{4} = -94.8934423930126$$
$$x_{5} = -96.8928834011562$$
$$x_{6} = -11.2670403350684$$
$$x_{7} = -84.8966552015697$$
$$x_{8} = -66.9050394202892$$
$$x_{9} = -52.9158878453223$$
$$x_{10} = -28.9637680695499$$
$$x_{11} = -88.8952785711013$$
$$x_{12} = -70.9027824711363$$
$$x_{13} = -22.9956743429519$$
$$x_{14} = -34.944635306683$$
$$x_{15} = -62.9076064711092$$
$$x_{16} = -58.9105523204319$$
$$x_{17} = -100.891835093096$$
$$x_{18} = -0.499999999997669$$
$$x_{19} = -92.8940267157492$$
$$x_{20} = -102.891342940009$$
$$x_{21} = -68.9038758069579$$
$$x_{22} = -80.898176250719$$
$$x_{23} = -36.9398496738743$$
$$x_{24} = -15.0992112626418$$
$$x_{25} = -40.931869569107$$
$$x_{26} = -26.9724642083011$$
$$x_{27} = -72.9017532287081$$
$$x_{28} = -17.0599780625207$$
$$x_{29} = -44.9254808278236$$
$$x_{30} = -86.8959501513526$$
$$x_{31} = -56.9121945298417$$
$$x_{32} = -64.9062803179504$$
$$x_{33} = -24.9829035818921$$
$$x_{34} = -46.9227412826675$$
$$x_{35} = -60.9090269872638$$
$$x_{36} = -21.0116663817728$$
$$x_{37} = -82.897396289058$$
$$x_{38} = -48.9202499123344$$
$$x_{39} = -54.9139676007207$$
$$x_{40} = -76.8998657163733$$
$$x_{41} = -42.928507656147$$
$$x_{42} = -98.8923481274058$$
$$x_{43} = -13.1596142661348$$
$$x_{44} = -32.9501029606816$$
$$x_{45} = -38.9356256256186$$
$$x_{46} = -90.8946381318121$$
$$x_{47} = -104.890870418355$$
$$x_{48} = -106.890416376157$$
$$x_{49} = -78.8989982294128$$
$$x_{50} = -50.9179744086582$$
$$x_{51} = -19.0322967957665$$