# Algebra

posted by Joy

Find ​(f◦​g)(x) and ​(g◦​f)(x).
I keep getting lost on these f(x) and g(x)problems

1. Steve

​(f◦​g) = f(g) = 4g^2+3 = 4(4x-2)^2+3
​(g◦f) = g(f) = 4f-2 = 4(4x^2+3)-2
now just simplify

sometimes it helps not to include all those (x)'s
​(f◦​g)(x) = f(g(x)) = f(4x-2) = 4(4x-2)^2+3
you can replace g first or evaluate f(g) and then plug in g

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