Question

If f(x) = 4x + 8 and g(x) = sqrt x + 4, what is (f o g)(12)?

Help please.. So confused.

Answer 1

\(f(g(x)) = f\left(\sqrt{x+4}\right) = 4\left(\sqrt{x+4}\right) + 8\)

What else would it be?

Answer 2

I don't know??

Answer 3

Okay, then if you don't know what else it would be, why not go with what you were just shown?

It's just substitution. That's all that is going on.

Answer 4

Okay, so where do I go from there?

Answer 5

@tkhunny

Answer 6

@Loser66 help?

Answer 7

tkhunny gave you the whole answer, where do you want to go ? DAT SIT

Answer 8

f(x) = 3x - 5
f(2) = 3(2) - 5
f(Dog) = 3(Dog) - 5
f(g(x)) = 3(g(x)) - 5

Substitution.