1. **State the problem:** Write the constants in the expression $8x^2 + 2y + 5$. 2. **Identify constants:** Constants are terms that do not change with variables. In this expression, $8x^2$ and $2y$ contain variables $x$ and $y$, so they are not constants. 3. **Find the constant term:** The term $5$ does not have any variable attached, so it is the constant. 4. **Answer:** The constant in the expression is $5$.