Question

If f(x) = 5x2 − 4 and g(x) = x − 2, what is (f o g)(-3)?

Answer 1

f(x) = 5x^2 - 4, so

f◦g = f(g) = 5g^2 - 4
= 5(x-2)^2 - 4

(f◦g)(-3) = 5(25)-4 = 121