Pre-Cal Help?

Question

We learned this in class friday morning, and now, sunday night, I totaly forgot it.

How do i find f of g?

For example, my problem (one of many) is

f(x)=2x g(x)= 3x^2 + 1

fog(4) = ?


Thankyou in advance.

Thanks man, its all coming back to me now, appriciate it. Ill give you best awnser. Once again, thanks!

Answer 1

f(x) = 2x
g(x) = 3x² + 1

(fog)(x) = f[g(x)] = f(3x² + 1) = 2(3x² + 1) = 6x² + 2

(fog)(4) = 6*4² + 2 = 6*16 + 2 = 96 + 2 = 98