You can
put this solution on YOUR website!
First of all make the above two square roots into surds as below:

=

=

Now we have find out the difference between the above 2. Since surds are
irrational numbers, they can be added or subtracted like real numbers. i.e.

-

=12

- 6

= (12-6)

= 6

. Answer
The same answer can be written as

by bringing the square of 6
inside the root and multiplying it by 2. In the similar manner, you can do
the additions also.
I hope this is clear to you.
gsm