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7 May, 00:31

Factor completely.

x2 + 4x - 21

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Answers (2)
  1. 7 May, 00:52
    0
    (x+7) (x-3)

    Step-by-step explanation:

    You can factor this trinomial into two binomials. 7 * - 3 multiply together to form - 21 and they add together to form 4.
  2. 7 May, 00:56
    0
    Step-by-step explanation:

    x² + 4x - 21 = x² + 7x - 3x - 3*7

    = x * (x + 7) - 3 (x + 7)

    = (x + 7) * (x-3)
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