# Math Help - rational expressions

1. ## rational expressions

i did 15b wrong... can someone show me how to do it correctly thanks

2. ## Re: rational expressions

Hello,

you didn't factor correctly the denominator of the 2nd fraction. The 2nd line should read:

$\frac{x+1}{x+6}-\frac{(x-2)(x+2)}{\color{red}x(x+2)\color{black}} \cdot \frac{x(2x+1)}{(2x+1)(x+3)}$