# Chapter 11 - Rational Expressions and Functions - 11-4 Adding and Subtracting Rational Expressions - Practice and Problem-Solving Exercises - Page 676: 34

The student did not realize that once you have a common denominator, the denominator stays the same for the answer. Instead, the student added the denominator, getting $2x+6$.

#### Work Step by Step

The student did not realize that once you have a common denominator, the denominator stays the same for the answer. Instead, the student added the denominator, getting $2x+6$. The denominator should have remained as $x+3$, making the final answer $\frac{5}{x+3}$.

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