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x = -b / 2a = - (-8) / 2(-4) = 8 / -8 = -1
nilai ekstrim (y ) substitusikan nilai x = -1
-4(-1)^2 -8(-1)+2
-4(1) + 8 +2
-4 + 8 + 2
6
titik balik atau puncak = (x,y) = (-1,6) B