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x3 + 13x2 + 42x

= x(x2 + 13x + 42)

= x(x2 + 6x + 7x + 42)

= x[x(x + 6) + 7(x + 6)]

= x(x + 7)(x + 6)

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Q: What is the factorization of this trinomial x3 plus 13x2 plus 42x?
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