Question

1. Given the functions a(x) = 3x − 12 and b(x) = x − 9, solve a[b(x)] and select the correct answer below.

a[b(x)] = 3x2 − 21
a[b(x)] = 3x2 − 39
a[b(x)] = 3x − 21
a[b(x)] = 3x − 39

Answer 1

a[b(x)] = 3x − 39

Explanation:

Answer 2

I think the answer is A: a[b(x)] = 3x2-21 because if you make this whole expression into an equation then solve x, you will get answer A. Hope this helps! :)