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gradien garis m = -2 ...(1)
y = x² + 2x + p
m = y' = 2x + 2 ......(2)
(1) = (2)
2x +2 = -2
x= -2 dan 2x + y -2= 0 --> y = 2 - 2x = 6
titik singgung (x,y) = (-2, 6)
sub ke y = x² + 2x+ p
6 = 4 -4 + p
p = 6
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