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Why is (\frac{x^2+1}{x}) not a polynomial?

Answer and explanation

Correct answer: Because the variable is in the denominator

A polynomial in \\(x\\) can contain only non-negative whole-number powers of \\(x\\). In the expression \\(\\frac{x^2+1}{x}\\), division by \\(x\\) gives \\(\\frac{x^2}{x}+\\frac{1}{x}=x+x^{-1}\\), wherever the expression is defined. The term \\(x^{-1}\\) has a negative exponent, so the expression is not a polynomial in \\(x\\).

Therefore, option B is correct: the variable occurs in the denominator. The presence of \\(x^2\\), the constant 1, or addition is not a problem by itself. For example, \\(x^2+1\\) is a polynomial. The important test is whether every variable power is a non-negative integer and no variable remains in a denominator after simplification.

Related tags

PolynomialDenominatorNon Polynomial

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