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Add content to stub (#34235)

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Just addition, gave formula and example.
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Alexander Molnar
2018-11-06 11:39:12 -05:00
committed by Paul Gamble
parent 4f37069835
commit ca1a7e1b77
1 changed files with 12 additions and 9 deletions
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guide/english/mathematics/subtracting-fractions/index.md
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@ -3,13 +3,16 @@ title: Subtracting Fractions
---
## Subtracting Fractions
This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/subtracting-fractions/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
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#### More Information:
<!-- Please add any articles you think might be helpful to read before writing the article -->
Subtracting fractions is a bit of a misnomer, as
```
(a/b) - (c/d) = (a/b) + (-c/d),
```
so there is nothing special going on here, it is just the usual [addition](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/guide/english/mathematics/adding-fractions/index.md) of fractions. Namely,
```
(a/b) - (c/d) = (a/b) + (-c/d) = (a*d - b*c)/(d*b).
```
For example,
```
1/7 - 3/8 = (1*8 - 7*3)/(7*8) = -13/56.
```