Answer :

Apocrophon
Having the square root of 25 * sqrt2 is more helpful because you know that the square root of 25 is 5, so the expression simplifies to become 5 * sqrt2, or 5sqrt2.
Because the root of 25 can be simplified to a whole number, the number 5. The root of 10 and the root of 5 can not be simplified to a whole number.

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