Question

Sendo f(x) = x2 + 2 x e g(x) = x - 5 então (f o g) (x) é:

Answer 1

(fog) (x) = f(g(x))

f(g(x)) = 2.(x-5) + 2. (x-5)
          =2x -10 + 2x -10
          = 4x - 20