Dividing radicals

10√2
--------
√5

10√2 √5
------------ {multiplied top and bottom by √5 to eliminating radical sign in denominator}
√5 √5

10√10
--------- {multiplied square roots on top and bottom}
√25 

10√10
---------- {evaluated √25 to be 5}
5

= 2√10 {cancelled 10 and 5}

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