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You should look for two numbers whose product is 40, and whose sum is 13. Experimenting a little (trying different pairs of factors for 40), you can quickly realize that this works for 8 and 5. Therefore,

x2 + 13x + 40 = (x + 8) (x + 5)

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14y ago

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(x + 8)(x + 5)

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9y ago
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Q: Factor the trinomial x2 plus 13x plus 40?
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