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Is (x^2+x^{-1}+x^0) a polynomial or not?

Answer and explanation

Correct answer: No, because (x^{-1}) has a negative power

For an expression to be a polynomial in \\(x\\), every exponent of \\(x\\) must be a non-negative whole number. In \\(x^2+x^{-1}+x^0\\), the terms \\(x^2\\) and \\(x^0\\) are allowed, but \\(x^{-1}\\) has a negative exponent. Indeed, \\(x^{-1}=1/x\\), which places the variable in a denominator.

One invalid term is enough to make the complete expression non-polynomial. Therefore, option C is correct. The number of terms does not decide whether an expression is a polynomial, and the presence of one valid term such as \\(x^2\\) cannot repair the invalid negative power. The correct test is to inspect every variable exponent and ensure all are non-negative integers.

Related tags

PolynomialNegative PowerZero Power

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