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2) koefisien dr x^3 = -6 → -6x^3
penjelasan :
(x-1)² . (x-2)²
= (x²-2x+1).(x²-4x+2)
= x².x² + x².(-4x) + x².2 + (-2x).x² + (-2x).(-4x) + (-2x).2 +
1.x² + 1.(-4x) + 1.2
= x^4-4x^3+2x²-2x^3+8x²-4x+x²-4x+2
= x^4-6x^3+11x²-8x+2