4. Add these rational expressions together. Be sure to simplify completely: 1lz + 24' 7+ 3 12 13 a) Sum: b) What values cannot be in the domain? -3 No spaces when you enter your answers.
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![### Subject: Mathematics - Rational Expressions
#### Final Exam Review 2021
**Question 13:**
_Add these rational expressions together. Be sure to simplify completely:_
\[
\frac{12}{x^2 + 11x + 24} + \frac{4}{x + 3}
\]
a) **Sum:**
\[
\text{(Enter the simplified form of the sum here)}
\]
b) **What values cannot be in the domain?**
\[
x \neq -3 \quad x \neq \text{(Enter the other value(s) here)}
\]
**Instructions:**
- No spaces when you enter your answers.
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This question is designed to test your knowledge of adding rational expressions and simplifying them. Make sure to factor polynomials where necessary and identify values that make the denominator zero, as these are not part of the domain.
#### Note:
The rational expression \(\frac{12}{x^2 + 11x + 24}\) can be factored, and you should compare denominators for common factors.
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