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Mathematics, 22.02.2020 23:59 zoeedadoll

In 1/a-b - 1/b-a
Why do we multiply the fraction by -1 to get the common denominator?
I factorised the denominators and got the wrong answer.
The answer is 2/a-b
Please explain, thank you

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In 1/a-b - 1/b-a
Why do we multiply the fraction by -1 to get the common denominator?
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