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przez grupowanie:
P(x)=x³-2x²-4x+8=x²(x-2)-4(x-2)=(x²-4)(x-2)=
- korzystam ze wzoru a²-b²=(a-b)(a+b)=
=(x-2)(x+2)(x-2)=(x-2)²(x+2)
=(x-2)*(x-2)*(x+2)
P(x)=x³-2x²-4x+8
P(x)= x²(x-2)-4(x-2)= (x-2)(x²-4)=(x-2)(x+2)(x-2)