Question

f(x) = 3x + 9, g(x) = 3x2

Find (fg)(x).

Answer 1

the answer choices are;
A. 9x + 27

B. 9x2 + 27x

C. 9x3 + 27x2

D. 3x2 + 3x + 9


I'm thinking it B.?

Answer 2

substitute the g(x) for x in f(x) eqn

f(g(x)) = 3 g(x) + 9

substitute and find the answer

Answer 3

so then it'd be A?

Answer 4

noo

Answer 5

wait.. bc is be 9x^3 so itd then have to be C? right

Answer 6

fg(x) = 9 x3 + 27

Answer 7

but theres no answer choice.. that have a 9xcubed +27?