## anonymous 3 years ago 1/b - 1/a all over 1/b + 1/a

1. anonymous

|dw:1346780283393:dw|

2. hba

|dw:1346780297317:dw|

3. hba

|dw:1346780395862:dw|

4. anonymous

or multiply top and bottom by $$ab$$ to clear the fractions

5. anonymous

|dw:1346780349837:dw|

6. anonymous

So it would be C

7. hba

^ right

8. anonymous

$\frac{\frac{1}{b}-\frac{1}{a}}{\frac{1}{b}+\frac{1}{a}}\times \frac{ab}{ab}$ $=\frac{a-b}{a+b}$

9. anonymous

it is always C well at least 75% of the time