Question

How do you evaluate `\frac { 7} { x + 8} - \frac { 1} { x - 8}`?

Answer 1

`(6x-64)/((x+8)(x-8))`

Explanation:

we need to put the two fractions over a common denominator

`7/(x+8)-1/(x-8)`

`(7(x-8))/((x+8)(x-8))-(x+8)/((x-8)(x+8))`

`(7x-56-x-8)/((x+8)(x-8)`

`(6x-64)/((x+8)(x-8))`