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

= +

=

=

idk

step-by-step explanation:

in mathematics, a constraint is a condition of an optimization problem that the solution must satisfy. there are several types of constraints—primarily equality constraints, inequality constraints, and integer constraints. the set of candidate solutions that satisfy all constraints is called the feasible set.

hoped i'm right lol