x4-7x3+9x2+7x-10 factorise
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dividend x4 - 7x3 + 9x2 + 7x - 10 - divisor * x3 x4 - 5x3 remainder - 2x3 + 9x2 + 7x - 10 - divisor * -2x2 - 2x3 + 10x2 remainder - x2 + 7x - 10 - divisor * -x1 - x2 + 5x remainder 2x - 10 - divisor * 2x0 2x - 10 remainder 0
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