1. **State the problem:** Evaluate the expression $y^2 - 5$ when $y = 3$.
2. **Write the expression:**
$$y^2 - 5$$
3. **Substitute the value of $y$:**
$$3^2 - 5$$
4. **Calculate the square:**
$$9 - 5$$
5. **Perform the subtraction:**
$$9 - 5 = 4$$
**Final answer:** $4$
Evaluate Expression 27Aa9B
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.