The first steps in writing f(x) = 3x² – 24x + 10 in vertex form are shown.
f(x) = 3(x² – 8x) + 10

(-8/2)² = 16

What is the function written in vertex form?

A. f(x) = 3(x + 4)2 – 6
B. f(x) = 3(x + 4)2 – 38
C. f(x) = 3(x – 4)2 – 6
D. f(x) = 3(x – 4)2 – 38