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10x⁴ -10x³ -15x² -4x³ +4x²= +6x +2x² -2x -3=
10x⁴ -14x³ -9x² +4x -3
(3x³ +2x² -3)(x + 1)=
3x⁴ +2x³ -3x +3x³ +2x² -3=
3x⁴ +5x³ +2x² -3x -3
(4x⁴ +2x³ -2x² -1)(x² - 1)=
4x^6 +2x^5 -2x⁴ -x² -4x⁴ -2x³ +2x² +1 =
4x^6 + 2x^5 -6x⁴ -2x³ +x² +1