How do I start out?

Question

g(x)=2x and h(x)=x-3. find (gh)(-4)

Answer 1

g(x) = 2x  h(x) = x-3

 

(gh)(x) = g(x)h(x) = 2x(x-3) = 2x² - 6x

 

So, (gh)(-4) = 2(-4)²-6(-4) = 32 + 24 = 56