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30 March, 21:19

4 radical 7 * 2 radical 10

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Answers (1)
  1. 31 March, 00:41
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    Remember

    (ab) (cd) = (a) (b) (c) (d)

    and

    (√a) (√b) = √ (ab)

    so

    (4√7) (2√10) = (4) (√7) (2) (√10) = (4) (2) (√7) (√10) = (8) (√70) = 8√70
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