What is the first step when rewriting y = 3x2 + 9x – 18 in the form y = a(x – h)2 + k?

Asked by wiki @ in Mathematics viewed by 356 People

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

Answered by wiki @

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.

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