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y=px-2 ⇒ y=x(x+1)-2
maka p=x+1
maaf jika salah
x^2 + x - px = 0
x^2 + (1-p)x = 0
menyinggung kurva berarti D=0
(1-p)^2 - 4 *1 * 0 = 0
(1-p)^2 = 0
1 - p = 0
p=1