What is the first step when rewriting y=-4x^2+2x-7 in the form y=a(x-h)^2+k?
a. 2 must be factored from 2x-7
b.-4 must be factored from -4x^2+2x
c. x must be factored from -4x^2+2x
d.-4 must be factored from -4x^2-7

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