The first three steps in writing f (x) = 40x + 5x2 in vertex form are shown.
Write the function in standard form. f (x) = 5x2 + 40x
Factor a out of the first two terms. f (x) = 5 (x2 + 8x)
Form a perfect square trinomial. = 16
f (x) = 5 (x2 + 8x + 16) - 5 (16)
What is the function written in vertex form?
A. f (x) = 5 (x + 4) - 80
B. f (x) = 5 (x + 8) - 80
C. f (x) = 5 (x + 4) 2 - 80
D. f (x) = 5 (x + 8) 2 - 80
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