10√2

--------

√5

--------

√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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