Question

Let f(x)=-3x-7 Abe g(x)=4x-5 find (f•g)(-3)

Answer 1

272

Explanation:

note that (f • g)(x) = f(x) × g(x) = (3x - 7)(4x - 5)

To evaluate substitute x = 3 into (3x - 7)(4x - 5)

(f • g)(- 3) = (- 9 - 7)(- 12 - 5) = - 16 × - 17 = 172