Which of the following algebric expressions are polynomials?
`x^3-2x+x^(-2)`

Explanation

To determine whether the given algebraic expression \( x^3 - 2x + x^{-2} \) is a polynomial, we need to analyze each term of the expression based on the definition of polynomials.

### Step-by-Step Solution:

1. **Identify the terms of the expression**:
The expression \( x^3 - 2x + x^{-2} \) consists of three terms:
- \( x^3 \)
- \( -2x \)
...