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Simplify: 11 X to the third power, minus 15 X to the second power, plus 2 X to the second power, plus 10 X to the second power, minus 3 X
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Group similar powers of X together so we have -15+2+10=-3X^2. The expression now becomes 11X^3-3X^2-3X. X is a common factor: X(11X^2-3X-3). The quadratic doesn't factorise further.

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