x² + 3x - 10. x² - x -6
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x⁴+2x³-8x²-18x
Explanation:
x²(x²-x-6)+3x(x²-x-6)
x⁴-x³-6x²+3x³-3x²-18x
x⁴-x³+3x³-6x²-3x²-18x
x⁴+2x³-8x²-18x
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