factorised (x^2 - 3x)(x^2- 3x+7)+10
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(x^2 - 3x) (x^2 - 3x + 7) + 10
= x^4 - 3x^3 + 7x^2 - 3x^3 + 9x^2 - 21x + 10
= x^4 - 6x^3 + 16x^2 - 21x + 10
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