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y = a(x - xp)^2 + yp
-5 = a(4 - 3)^2 + (-4)
-5 + 4 = a(1)^2
-1 = a
y = a(x - xp)^2 + yp
y = -1(x - 3)^2 + (-4)
y = -1(x^2 - 6x + 9) - 4
y = -x^2 + 6x - 9 - 4
y = -x^2 + 6x - 13