What is the first step when rewriting y = 6x2 + 18x + 14 in the form y = a(x – h)2 + k?

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What is the first step when rewriting y = 6x2 + 18x + 14 in the form y = a(x – h)2 + k?
A.16 must be factored from 18x + 14
B.x must be factored from 6x2 + 18x
C.6 must be factored from 6x2 + 14
D.6 must be factored from 6x2 + 18x