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X1.X2= c/a = (3p-2)/1 = (3p-2)
♦ X1² - 2X1X2 + X2² = 0
(X1 + X2)² - 4X1X2 = 0
(2p)² - 4(3p-2) = 0
4p²-12p+8=0
p²-3p+2=0
(p-2)(p-1)=0
p=2 dan p=1
semoga membantu :)