2√3 times 4√21

the answer is 24√7 but I don't understand how you would get that.

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asked by Emma
  1. 2 sqrt (3) * 4 sqrt (3 * 7)

    = 8 sqrt (3*3*7)

    = 8*3 * sqrt (7)

    = 24 sqrt (7)

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    posted by Damon

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