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# How to add/subtract two algebraic fractions with common denominators? Watch

1. Such as:

8/(x-5)(x+7) - 1/(x-5)(x-2)

Title is worded slightly stupidly.

How to add/subtract two algebraic fractions with common factors
2. The denominator remains the same, you just subtract/add the top numbers. So in this case it's 8 - 7.

Just think if I had 3/4 and took 1/4, I'd have 2/4 left.

EDIT: Ignore that, just realised the second bracket was different. Do cross multiplication to get rid of the thing that isn't common.
3. (Original post by BTAnonymous)
Such as:

8/(x-5)(x+7) - 1/(x-5)(x-2)
Same way as you would for a normal number one.

Like:

.

Here it's just:

4. (Original post by Zacken)
Same way as you would for a normal number one.

Like:

.

Here it's just:

Excellent! Thank you again!
5. (Original post by BTAnonymous)
Excellent! Thank you again!
No problem!

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Updated: May 16, 2016
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