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y = y
x²+x-2 = px-2
x²+x-px-2+2 = 0
x²+(1-p)x = 0
a = 1, b = (1-p), dan c = 0
D => b²-4ac = 0
(1-p)²-4.1.0 = 0
(1-p)² = 0
1-p = 0
p = 1
semoga membantu ya :)
y=x²+x-2 maka y'=2x+1. (merupakan gradien)
maka nilai p=2x+1