Question

The first three steps in writing f(x) = 40x + 5x2 in vertex form are shown. What is the function written in vertex form?

Answer 1

F(x) = 5(x + 4) – 80
f(x) = 5(x + 8) – 80
f(x) = 5(x + 4)2 – 80
f(x) = 5(x + 8)2 – 80