1. The problem is to simplify or work with the expression $x^3$. 2. The expression $x^3$ means $x$ multiplied by itself three times: $x \times x \times x$. 3. There are no additional terms or coefficients to combine or simplify. 4. Therefore, the expression remains as $x^3$. 5. This is a cubic term representing the cube of $x$. Final answer: $x^3$