How can unlike radicals be changed into like radicals?

(a-2(ab)1/2+b)/(a-b)

Radicals are atoms of different elements which have combined together and cannot exist independently. They are charged particles and are highly reactive.

Radical expressions are called like radical expressions if the indexes are the same and the radicands are identical.

Me, myself and I

you have to square the outside number and then multiply it by the number inside the squareroot sign.