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posted by sunny Tuesday, June 17, 2014 at 7:00pm.

what is the vertex of y=x^2-4 ??

x^2 - 4 = y x^2 - 4 + (4/2)^2 = y + (4/2)^2 (x-2)^2 = y + 4 so vertex at (2,-4)

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