Question

Find a.) (fog)(3) and b.) (gof) (-2) f(x)=x^2+4 , g(x)= sqrt. x+1. How would I get the answers a)8 and b)3?

Answer 1

(fog)(3) f of (g) of (3)
means f(g(3))
3 replaces x in g(x), solve and use value as x in f(x)

(gof)(-2) g of (f) of (-2)
g(f(-2))
-2 in place of x in f(x), solve and use value as x in g(x)

Answer 2

Are you following?

Answer 3

Yes, I'm trying to understand it. Thanks for your time. c: