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30 June, 23:10

Witch of the binomials below is a factor of this trinomial

x^2 + 19x + 84

A) x-7

B) x^2+12

C) x+84

D) x+7

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Answers (1)
  1. 30 June, 23:27
    0
    Let's factor the trinomial.

    x^2+19x+84.

    Find two numbers that add to 19 and multiply to 84.

    They happen to be 7 and 12.

    x^2+7x+12x+84

    x (x+7) + 12 (x+7)

    Gather like terms.

    (x+7) (x+12)

    Therefore, the answer is D.
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