​f′(x)=g(x)g′(x)=f′′(x)f(x)=∫ax​g(t)dtg(x)=f′(x)g′(x)=f′′(x)g(x)⋅g′(x)=f′(x)f′′(x)​ Graph of f(x) can be drawn asIf f(x)=0 has at least 5 real roots f′(x)=0 has at least 4 real root f′′(x)=0 has at least 3 real root f′(x)f′′(x)=0 has at least 7 real root g(x)g′(x)=0 has atleast 7 real root