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

asked Nov 16, 2017 159k views

2 votes

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

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4 votes

Answer:

Explanation:

Luiggi Mendoza answered Nov 16, 2017

8.1k points

2 votes

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)

Hadi Tok answered Nov 22, 2017

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