1. **State the problem:** Expand the expression $6e + 15$. 2. **Understand the expression:** The expression consists of two terms: $6e$ and $15$. Here, $e$ is the mathematical constant approximately equal to 2.71828. 3. **Expansion:** Since the expression is already simplified and consists of two terms added together, there is no further expansion needed. 4. **Final answer:** The expression $6e + 15$ is already in its expanded form. Therefore, the expanded form is: $$6e + 15$$