Can someone help me to answer this
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.