f(x) = (x+4)

g(x) = (4x-1)

h(x) = g(x) x f(x)

= (x+4)*(4x-1)

Open brackets:

==> h(x) = 4x^2 - x + 16x - 4

= 4x^2 + 15x - 4

Then ,

**h(x) = 4x^2 + 15x - 4**

f(x) = (x+4)

g(x) = (4x-1)

h(x) = g(x) x f(x)

= (x+4)*(4x-1)

Open brackets:

==> h(x) = 4x^2 - x + 16x - 4

= 4x^2 + 15x - 4

Then ,

**h(x) = 4x^2 + 15x - 4**