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18 July, 11:45

3) x2 + 4x - 21

A) (x - 3) (x - 7)

0) Not factorable

& (x-3) (x+7)

(x+3) (x-7)

+3
Answers (1)
  1. 18 July, 11:58
    0
    (x - 3) (x + 7)

    Step-by-step explanation:

    x² + 4x - 21

    Factor using the AC method.

    1 * - 21 = - 21

    Factors of - 21 that add up to 4: 7 and - 3

    Divide by 1 and reduce: 7/1 and - 3/1

    Factors are x + 7 and x - 3

    x² + 4x - 21 = (x + 7) (x - 3)
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