1. **State the problem:** Simplify the expression $ (c4 \times b2) - a3 $. 2. **Interpret the variables:** Assuming $c4$, $b2$, and $a3$ represent variables or terms, the expression means multiply $c4$ by $b2$ then subtract $a3$. 3. **Write the formula:** The expression is $c4 \times b2 - a3$. 4. **Simplify step-by-step:** Since no values or further operations are given, the simplified form remains $c4b2 - a3$. 5. **Explanation:** Without numerical values or additional context, the expression is already in its simplest algebraic form. **Final answer:** $c4b2 - a3$