1. **State the problem:** Evaluate the expression $x^2 + 9x + 5$ when $x = 1$. 2. **Write the expression:** The expression is $x^2 + 9x + 5$. 3. **Substitute the value:** Replace $x$ with 1: $$1^2 + 9(1) + 5$$ 4. **Calculate each term:** - $1^2 = 1$ - $9(1) = 9$ 5. **Add the terms:** $$1 + 9 + 5 = 15$$ 6. **Final answer:** When $x = 1$, the value of $x^2 + 9x + 5$ is $15$.