I am supposed to simplify 1/a-b - 1/b-a

The answer is 2/ a-b

But I don't know how they got the denominator during the working and the final answer.
Please help, thank you

see explanation

Step-by-step explanation:

Given

-

Before subtracting the fractions, we require them to have common denominator.

Multiply the numerator/denominator of the second fraction by - 1

× =

We now have

- ← common denominators

= +

=

=

answer: a

step-by-step explanation:

36/60

36/2=18

60/2=30

18/30

18/3=6

30/3=10

6/10

6/2=3

10/2=5

your final answer would be 3/5 of an

hope this !