Answer:
D. x² -1
Explanation:
You want to identify the polynomial among the given expressions.
Polynomial
A polynomial is a sum of terms that are products of variables that have whole number exponents. There may be a constant multiplier (coefficient) that is part of the term.
A — x^-4 has a negative exponent
B — 1/x = x^-1, a negative exponent
C — this is a rational expression, the ratio of two polynomials. It is not a polynomial.
D — x² -1 is a polynomial
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Additional comment
A constant term can be considered as a term with variable(s) to a power of 0. That is, it has degree 0.
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