1. The problem asks to write an expression for the product of 7 and 15 without solving it. 2. The product of two numbers means multiplying them together. 3. The multiplication operation is represented by the symbol $\times$. 4. Therefore, the expression for the product of 7 and 15 is: $$7 \times 15$$ This expression shows the multiplication of 7 and 15 but does not calculate the result.