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y = a( x - Xp)^2 + Yp
8 = a(0 - 3)^2 - 1
8 = 9a - 1
9 = 9a
a = 1
y = 1(x - 3)^2 - 1
y = x^2 - 6x + 9 - 1
y = x^2 - 6x + 8