Question

Given the functions k(x) = 5x − 8 and p(x) = x − 4, solve k[p(x)] and select the correct answer below.

1) k[p(x)] = 5x − 12
2) k[p(x)] = 5x − 28
3) [p(x)] = 5x2 − 12
4) k[p(x)] = 5x2 − 28

Answer 1

p(x) = x-4

k(x-4) = 5(x-4) - 8 = 5x - 28

So the answer is 2