Question

Let f(x) = x2 – 7x + 3 and g(x) = x + 4. Find f(x) + g(x).

Answer 1

just add them

Answer 2

g(-1) = (-1)^2 - 7(-1) - 9
g(-1) = -2+7-9
g(-1) = -1

now you plug -1 (which is g(-1)) into f(x) in place of x.

f(-1) = -1 - 2
f(-1) = -3