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y=a(x-5)^2 - 4
masukkan (3,-12) ke fungsi diatas
-12=a(3-5)^2 - 4
-12 + 4 = 4a
-8=4a
-2=a
maka
y=-2(x-5)^2 - 4
buka kurung nya:
y=-2x^2+20x-54