El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{x} \left(5 - 4 x\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = \frac{5}{4}$$
Solución numérica$$x_{1} = -79.182393229406$$
$$x_{2} = -59.3141197601814$$
$$x_{3} = -113.078359769017$$
$$x_{4} = -105.096005506482$$
$$x_{5} = -109.086819829748$$
$$x_{6} = -95.1228332122747$$
$$x_{7} = -45.5034493586155$$
$$x_{8} = -67.2498537857137$$
$$x_{9} = -87.1494373367173$$
$$x_{10} = -85.1569988527312$$
$$x_{11} = -61.2960644519732$$
$$x_{12} = -63.2794412322068$$
$$x_{13} = -71.2243046133053$$
$$x_{14} = -33.8839602590177$$
$$x_{15} = -91.1354624175195$$
$$x_{16} = 1.25$$
$$x_{17} = -81.1734372801578$$
$$x_{18} = -41.5926600171555$$
$$x_{19} = -73.2127926752032$$
$$x_{20} = -111.082504594721$$
$$x_{21} = -69.2366283719973$$
$$x_{22} = -65.2640845870997$$
$$x_{23} = -77.1919012414924$$
$$x_{24} = -93.1289921013747$$
$$x_{25} = -51.4052170340184$$
$$x_{26} = -57.3338032364493$$
$$x_{27} = -53.3790392355395$$
$$x_{28} = -115.074375428221$$
$$x_{29} = -35.7899178935202$$
$$x_{30} = -89.1422685075093$$
$$x_{31} = -75.2020143539367$$
$$x_{32} = -119.066852221839$$
$$x_{33} = -49.4343045393742$$
$$x_{34} = -43.5450223021379$$
$$x_{35} = -101.106014674414$$
$$x_{36} = -47.4668273857519$$
$$x_{37} = -107.091316236591$$
$$x_{38} = -97.1169637104887$$
$$x_{39} = -83.164986411661$$
$$x_{40} = -37.7126387967774$$
$$x_{41} = -121.063297019985$$
$$x_{42} = -55.3553490317502$$
$$x_{43} = -39.6478512113387$$
$$x_{44} = -117.070542405779$$
$$x_{45} = -103.100900362124$$
$$x_{46} = -99.1113635954418$$