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X3 + 13X2 + 40X

factor out an X

X(X2 + 13X + 40)

factor the quadratic expression, what two factors of 40 add up to 13?

X(X + 8)(X + 5)

works the same if that is a negative in front of X3, just sign changes

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Q: What is the factorization of the trinomial- x3 plus 13x2 plus 40x?
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