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25 November, 13:12

Which of the binomials below is a factor of this trinomial?

x2 + 13x + 42

A. x - 7

B. x + 7

C. x + 84

D. x2 + 12

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Answers (1)
  1. 25 November, 13:29
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    First factor x² + 13x + 42.

    x² + 6x + 7x + 42

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

    The factors are : (x + 7) (x + 6)

    Solution: B. x + 7
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