sir i am unable to take out the answer of sums in roots.can you explain it to me.

The calculation becomes simpler if you factorise the numbers given under root sign and then you can make pairs of factors.

 

Example:

sqt (150*90*50*10)

= sqrt (3 * 5 * 10 * 3 * 3 * 10 * 5 * 10 * 10)

= sqrt (3 * 5 * 5 * 10 * 10 * 3 * 3 * 10 * 10)

= 5 * 10 * 3 * 10 sqrt (3)

= 1500 sqrt (3)