abaikan yang bercoret - coret

x² + 3x - 2
= x² + x + 2x + 2 - 4
= x(x + 1) + 2(x + 1) - 4
sisa pembagiannya -4

x³ - 4x² + px + 6
= x³ + x² - 5x² - 5x + 5x + px + 6
= x²(x + 1) - 5x(x + 1) + (5 + p)x + 5 + p - p + 1
= x²(x + 1) - 5x(x + 1) + (5 + p)(x + 1) - p + 1

-p + 1 = -4
-p = -5
p = 5