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x = -3/2
2(-3/2)³+p(-3/2)²-8(-3/2)-12 = 0
-27/4 + 9p/4+12-12 = 0
9p/4 = 27/4
p = 3
x² -4 --------------------> hasil bagi
2x+3 / 2x³+3x²-8x-12
2x³+3x²
------------------------- -
-8x-12
-8x-12
------------- -
0
hasil bagi : x²-4 = (x-2)(x+2)
sehingga faktor linier lain x+2