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21 March, 19:25

Factoring

x^2-4x-21=0

+3
Answers (1)
  1. 21 March, 21:57
    0
    Find two numbers that add to - 4 and that multiply to - 21.

    After playing around with some numbers, I got - 7 and 3.

    So, the factored form is (x - 7) (x + 3).
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