Question

Let f(x) = 6x^2 + 5 and g(x) = 3x - 5. Find f(g(7)).

A) 538
B) 892
C) 1287
D) 1541

Answer 1

D) 1541

Explanation:

I like to answer it w without deriving the formula of f(g(x)). So, we go this way, you firstly have to find g(7) which will be equal to 3 * 7 - 5 = 16.

And then you find f(16) = 6*16*16+5 = 1541. That's all.