El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{9 - x} \left(8 - x\right) = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 8$$
Solución numérica$$x_{1} = 121.389949729147$$
$$x_{2} = 8$$
$$x_{3} = 91.4785626915261$$
$$x_{4} = 85.5062407712727$$
$$x_{5} = 99.4482816547886$$
$$x_{6} = 65.6533514231885$$
$$x_{7} = 115.40315817241$$
$$x_{8} = 109.418161552262$$
$$x_{9} = 57.758798960419$$
$$x_{10} = 44.1413894508705$$
$$x_{11} = 51.8762545098096$$
$$x_{12} = 119.394173451874$$
$$x_{13} = 49.9272307499711$$
$$x_{14} = 93.4703620749206$$
$$x_{15} = 117.398572537176$$
$$x_{16} = 67.6328238138969$$
$$x_{17} = 87.496455118891$$
$$x_{18} = 53.8319875396224$$
$$x_{19} = 55.7931569932505$$
$$x_{20} = 95.4626045093137$$
$$x_{21} = 61.7006804984823$$
$$x_{22} = 73.580821222158$$
$$x_{23} = 71.5967547129854$$
$$x_{24} = 89.4872456640903$$
$$x_{25} = 46.0568716419232$$
$$x_{26} = 103.435354026019$$
$$x_{27} = 69.614029218278$$
$$x_{28} = 63.67586733869$$
$$x_{29} = 77.5523925194344$$
$$x_{30} = 97.4552548670559$$
$$x_{31} = 42.2454094695441$$
$$x_{32} = 83.5166588459953$$
$$x_{33} = 40.3772961851972$$
$$x_{34} = 113.407942520376$$
$$x_{35} = 79.5396566043977$$
$$x_{36} = 101.441656553331$$
$$x_{37} = 107.42362649804$$
$$x_{38} = 81.5277731870455$$
$$x_{39} = 105.429350983852$$
$$x_{40} = 47.9866376954424$$
$$x_{41} = 111.412938828373$$
$$x_{42} = 75.5660769899711$$
$$x_{43} = 59.7281686335153$$