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Fungsi Kuadratmaksimum 4 di x = 1 ---> (p,q) = (1,4)
y = a(x-p)² + q
y = a(x -1)² + 4
nilai 0 untuk x = 3 --> (x1,y1) = (3,0)
0 = a(3-1)² + 4
0 = 4a + 4
a = -1
fungsi kuadrat y = a(x-1)² + 4
y = - 1(x-1)²+ 4
y = - (x² -2x + 1) + 4
y = - x² + 2x -1 + 4
y = - x² + 2x + 3
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