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Substitusi ke persamaan x³+2x²-px+2
Karena habis dibagi, maka
x³+2x²-px+2 = 0
(-2/3)³ + 2(-2/3)² - p (-2/3) + 2 = 0
(-8/27) + 8/9 + 2p/3 + 2 = 0 x 27
-8 + 24 + 18p + 54 = 0
18p = -54 - 24 +8
18p = -70
p = -70/18 = -35/9