Question

explain the thing.........

solve further​

Answer 1

This is rationalization of denominator.

In second step the denominator is written that way because of the identity - [ (a+b) (a-b) = a^ - b^]

In third step denominator is written like that because root and square cancel each other.

HOPE IT HELPS ❤.

Answer 2

Answer:

denominator rationalised..refer to attachment plz