Answer :
g'(x)=(x^2)'(f(x))+(f'(x))(x^2)
g'(x)=(2x)(f(x))+(f'(x))(x^2)
for g'(3)
g'(3)=(2(3))(f(3))+(f'(3))(3^2)
g'(3)=(6)(5)+(-2)(9)
g'(3)=30-18
g'(3)=12
g'(x)=(x^2)'(f(x))+(f'(x))(x^2)
g'(x)=(2x)(f(x))+(f'(x))(x^2)
for g'(3)
g'(3)=(2(3))(f(3))+(f'(3))(3^2)
g'(3)=(6)(5)+(-2)(9)
g'(3)=30-18
g'(3)=12