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x²+2x+p=0 maka a = 1, b = 2 dan c = p
D = b²-4ac
0 = 2² - 4.1p
0 = 4 -4p
4p = 4
p = 4/4
= 1
Jadi agr persamaan kudrat itu mempunyai akr kembar p harus = 1