What is f(x) = 8x^2 + 4x written in vertex form?

f(x) = 8 (x+1/4)^2-1/2
f(x) = 8 – (x+1/4)^2-1/16
f(x) = 8 – 2
f(x) = 8 – 4
5 min. left on unit test