Question

Use
f(x) = 3x − 5
and
g(x) = 4 − x2
to evaluate the expression.

(a)
(f o g)(−2)

(g o f)(−2)

Answer 1

So basically f o g means just take the function f(x) and just take all the places where there's an x and put in whatever g(x) is. So:

f(x)=3x-5

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

f(x)=3(4-x^2)-5

now you can plug in -2 to it like they ask you, after a little more simplification if you so desire. I can help you a little more if you have any questions.