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3 x2 + x2 = p + 3
4 x2 = p+3
x2 = 1/4 (p+3)
.
x1x2 = 2p+2
3 x2.x2 = 2p +2
3 ([1/4 (p+3)]² = 2p + 2
3 { 1/16 (p+3)² ) = 2p + 2
3/16 (p+3)² = 2p + 2 ...
3(p²+6p+9) = 16(2p+2)
3p² +18p + 27 = 32 p + 32
3p² - 14 p - 5 = 0
(3p + 1)(p - 5) = 0
p = - 1/3 atau p = 5
..