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Unfortuanately, you can't factor this polynomial. To do so, you must find a pair of numbers that add up to the coefficient of the middle term, and multiply to equal the product of the coefficients of the first and last terms. In other words, we want a pair of numbers that add up to make -11, and multiply to make 21. Unfortunately there are no natural numbers that meet that condition.

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Q: How do you factor x2 -11x plus 21?
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