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D = 0
{2(p+3)}² - 4(3p)(p+1) = 0
4 (p+3)²- 4(3p)(p+1) = 0
(p+3)² - 3p(p+1) = 0
p²+6p+9 - 3p²- 3p = 0
-2p² + 3p + 9 = 0
2p² - 3p - 9) = 0
(2p+3)(p-3) = 0
p = - 3/2 atau p = 3