1. The problem is to multiply the two variables $A$ and $B$. 2. The multiplication of two variables is expressed as $A \times B$ or simply $AB$. 3. Since $A$ and $B$ are variables, the product is written as $AB$. 4. There is no further simplification unless values for $A$ and $B$ are given. Therefore, the product of $A$ and $B$ is $AB$.