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20 August, 09:44

Suzie simplified the following expression. What mistake did she make?

2 (3 + 9x) - 2x

6 + 9x - 2x

6 + 7x

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Answers (1)
  1. 20 August, 10:17
    0
    She forgot to distribute the 2 fully.

    ie. After the 3 to the 9x.

    It should have been,

    2 (3 + 9x) - 2x

    6 + 18x - 2x

    6 + 16x
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