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2x²+2x-6x-6=x³-6x-3x²+18
2x²+3x²-4x+6x-x³=6+18
5x²+2x-x³=24
2x² +2x - 6x -6 = x³ -6x -3x² + 18
-x³ + 2x² +2x + 3x² - 6 - 18 = 0
-x³ + 5x² +2x - 24 = 0
W (3) = 0
teraz trzeba podzielic ten wielomian przez x-3
i wyjdzie:
-x² + 2x + 12 = 0
delta = 4 + 48 = 52
√delta = √52
x₁ = (-2 - √52 ) / -2
x₂ = (-2 + √52) / -2