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9 January, 05:40

Factor the following expression:

x2-4x-21

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Answers (1)
  1. 9 January, 07:26
    0
    (x - 7) (x + 3)

    Step-by-step explanation:

    Step 1: You need to find out what to numbers add up to - 4 and multiply - 21?

    -7 and 3

    Step 2: Just rewrite the expression using the above and you're done!

    (x - 7) (x + 3)
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