# RATL 3 | Lesson 1 | Solution (Writing a Rational Expression)

One possible solution:

$$\Large\frac{x+2}{(x-7)(x+1)}$$

In order to write this expression, the denominator had to be zero if x was 7 or -1.  Substituting 3 for x into the denominator simplifies to -16. The numerator must solve for 5 when $$x = 3$$.