Question

If
f(x) = x^2 + 2x − 8
and
g(x) = 2x − 6,
find the following function.
f ∘ g

Answer 1

f∘g = f(g) = g^2+2g-8 = (2x-6)^2+2(x-6)-8

now just expand that out if you must.