El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$\operatorname{erfc}{\left(\sqrt{\frac{x}{2}} \right)} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución numérica$$x_{1} = 135.837807771685$$
$$x_{2} = 59.0540354907156$$
$$x_{3} = 85.549907360666$$
$$x_{4} = 81.5048510627873$$
$$x_{5} = 52.7835164771547$$
$$x_{6} = 63.1787222434871$$
$$x_{7} = 99.669173540688$$
$$x_{8} = 107.719182317854$$
$$x_{9} = 93.6240472200673$$
$$x_{10} = 127.810417145601$$
$$x_{11} = 141.855929327413$$
$$x_{12} = 56.9778136680401$$
$$x_{13} = 123.795087212409$$
$$x_{14} = 137.844058569785$$
$$x_{15} = 54.8889617588345$$
$$x_{16} = 109.730218958026$$
$$x_{17} = 71.3569805346552$$
$$x_{18} = 79.4797816509005$$
$$x_{19} = 115.760438748188$$
$$x_{20} = 97.6549593412607$$
$$x_{21} = 91.6071955428141$$
$$x_{22} = 139.8500954495$$
$$x_{23} = 83.5281647150868$$
$$x_{24} = 50.655403406248$$
$$x_{25} = 75.4234718795507$$
$$x_{26} = 129.817650128436$$
$$x_{27} = 111.740751500718$$
$$x_{28} = 95.6399413276272$$
$$x_{29} = 89.5892940713581$$
$$x_{30} = 133.831331331777$$
$$x_{31} = 121.786954603914$$
$$x_{32} = 131.824616642943$$
$$x_{33} = 113.750814337005$$
$$x_{34} = 117.769653254592$$
$$x_{35} = 101.682648296228$$
$$x_{36} = 77.4527402519758$$
$$x_{37} = 105.707603675317$$
$$x_{38} = 125.802901877749$$
$$x_{39} = 119.778483917865$$
$$x_{40} = 87.5702379457189$$
$$x_{41} = 61.1203537889134$$
$$x_{42} = 103.695441141831$$
$$x_{43} = 65.230586688428$$
$$x_{44} = 73.3916733050811$$
$$x_{45} = 67.2770456110038$$
$$x_{46} = 69.3189520033809$$