What is the first step when rewriting y = 3x2 9x - 18 in the form y = a (x - h) 2 k? 3 must be factored from 3x2 9x x must be factored from 3x2 9x 9 must be factored from 9x - 18 3 must be factored from 3x2 - 18

Question

Adelyn Vargas

Mathematics

19 September, 20:42

What is the first step when rewriting y = 3x2 9x - 18 in the form y = a (x - h) 2 k? 3 must be factored from 3x2 9x x must be factored from 3x2 9x 9 must be factored from 9x - 18 3 must be factored from 3x2 - 18

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Answers (1)

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Gabriella Ortega · Answer 1

Steps in rewriting:

y = 3 x² + 9 x - 18 = 3 (x² + 3 x) - 18 = 3 ((x² + 3 x + 9/4) - 9/4) - 18 =

= 3 (x + 3/2) ² - 27/4 - 18 = 3 (x + 3/2) ² - 99/4

Answer:

A) 3 must be factored from 3 x² + 9 x.