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Factorising -x2 + 7x + 18:

(a - x)(x + b) = -x2 + (b - a)x + ab

so ab = 18, b - a = 7 giving a = 2, b = 9:

(2 - x)(x + 9)

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14y ago
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12y ago

-x2+7x+18 = (-x-2)(x-9) when factored

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Q: How do you factor-x2 plus 7x plus 18?
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