Question

h(g(x)) if h(x)=x^2-4x+7 and g(x)=x+1

Answer 1

h(g(x)) = (?)^2 -4(?) + 7

fill in the ? with x+1

Answer 2

so you'll get:
h(g(x)) = (x+1)^2 - 4(x+1) + 7

Answer 3

now simplify...
h(g(x)) = (x^2 + 2x + 1) - 4x - 4 + 7
= x^2 - 2x + 8