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Which of the binomials is a factor of this trinomial?

Which of the binomials is a factor of this trinomial?-example-1
User John Foley
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\begin{gathered} x^2+6x-40=(x+10)(x-4) \\ The\text{ binomial }x-4\text{ is a factor of the }trinomial\text{ } \end{gathered}

User AndrewShmig
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