Answer :
f(x)=4x-1
g(x)=x2+7
g(f)(x)= (4x-1)2+7
= (4x-1) (4x-1) + 7
= 16x2 -4x -4x + 1 +7
= 16x 2 -8x +8x
g(x)=x2+7
g(f)(x)= (4x-1)2+7
= (4x-1) (4x-1) + 7
= 16x2 -4x -4x + 1 +7
= 16x 2 -8x +8x