Originally Posted by

**alane1994** Because, like I told you you multiply both the numerator and denominator by $\displaystyle x+1$...

$\displaystyle x^2-1$ remained in the denominator because it is the least common denominator...

Not to be rude, but you need to brush up on your basic fraction mathematics. You can't do this level if you don't have a firm grasp on fractions with just numbers...

Tell me what these would equal.

$\displaystyle 1)\frac{8}{5}+\frac{3}{7}=$

$\displaystyle 2)\frac{1}{6}-\frac{7}{9}=$

$\displaystyle 3)\frac{5}{8}\times\frac{2}{5}=$

$\displaystyle 4)\frac{3}{7}\div\frac{9}{13}=$