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y = x² + 5x - 6
.
kurangkan
x² - 8x + 12 = 0
(x - 6)(x - 2) = 0
x = 6 atau x = 2
.
untuk x = 6 dan y = x² + 5x - 6
y = (6)² + 5(6) - 6
y = 36+30-6 = 60
untuk x = 2
y = (2)² + 5(2) -6
y = 4 + 10 - 6
y= 8
HP (6,60) dan (2,8) = (a,b), (c,d)
b = 60 dan d = 8
b + d = 68