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What is f(x) = 7x2 + 42x written in vertex form?

A. f(x) = 7(x + 6)2 – 6
B. f(x) = 7(x + 6)2 – 42
C. f(x) = 7(x + 3)2 – 9
D. f(x) = 7(x + 3)2 – 63

User Chimerical
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2 Answers

4 votes

Answer:

D.

Explanation:

User Luiggi Mendoza
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f(x)= 7 x² + 42 x = 7 ( x² + 6 x ) = 7 ( ( x² + 6 x + 9 ) - 9 ) =
= 7 ( x + 3 )² - 63 (vertex form)
Answer: D)
User Hadi Tok
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