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Okay, this is the rule for dividing surds:

sqrt (a)

______

sqrt (b) = sqrt (a/b)

so for example you had

sqrt 3

_____

sqrt 21 = sqrt (3/21) = sqrt (7)

more complicated...

3 sqrt(3)

________

4 sqrt(21) = 3/4 sqrt (3/21) = 3/4 sqrt (7)

It's pretty easy as long as you can remember the rule. I hope that helps. XD

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14y ago

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