What is the result of substituting for y in the bottom equation? y=x-3
y=x2 + 2x - 4
A. - 3 = x2 + 2x - 4
B. y=x2 + 2x - 4 - (x-3)
C. y=(x - 3)2 + 2(x - 3) - 4
D. (x - 3) = x2

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