F[x_]:=x^3+8
T[x_]:=Sin[x]+Cos[x]
Plot[{F[x],T[x]},{x,-5,5},Filling->Axis,FillingStyle->{Directive[Yellow,Opacity[0.3]],Directive[Green,Opacity[0.3]]},AxesStyle->{Directive[Dashed],Black}]

F[x_]:=x^3+8
T[x_]:=Sin[x]+Cos[x]
Plot[{F[x],T[x]},{x,-5,5},Filling->Axis,FillingStyle->{Directive[Yellow,Opacity[0.3]],Directive[Green,Opacity[0.3]]},AxesStyle->{Directive[Dashed],Black}]