Final answer:
Yes, 5x^4 + 3x^2 - 6x^2 + 2x - 1 is a polynomial.
Step-by-step explanation:
Yes, 5x^4 + 3x^2 - 6x^2 + 2x - 1 is a polynomial.
A polynomial is an algebraic expression with one or more terms, where each term consists of a constant coefficient multiplied by one or more variables raised to a non-negative integer power. In this expression, all terms consist of valid combinations of coefficients and variables raised to non-negative integer powers, so it qualifies as a polynomial.