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titk (x1,y1) = (2, -6)
fungsi kuadrat y = a (x-p)² + q
y1 =a(x1- p)² + q
-6 = a(2+1)² + 3
-6 = 9a + 3
-9 = 9a
a= - 1
y = -(x +1)² + 3
y = -(x² + 2x + 1) + 3
y = - x² - 2x + 2
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