factorise x⁵‐2x²‐x+2
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x⁵-2x²-x+2
=x⁵-x⁴+x⁴-x³+x³-x²-x²+x-2x+2
=x⁴(x-1)+x³(x-1)+x²(x-1)-x(x-1)-2(x-1)
=(x-1) (x⁴+x³+x²-x-2)
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