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Why is \(\frac{x^3+1}{x}\) not a polynomial?

Answer and explanation

Correct answer: On simplifying, it contains the term \(\frac{1}{x}=x^{-1}\), in which the exponent of \(x\) is negative.

\(\frac{x^3+1}{x}=\frac{x^3}{x}+\frac{1}{x}=x^2+\frac{1}{x}=x^2+x^{-1}\). In a polynomial, every exponent of the variable must be a non-negative integer. Here, \(x^{-1}\) has exponent \(-1\), so the expression is not a polynomial. Having \(x^3\), a binomial numerator, or a constant term does not prevent an expression from being a polynomial. Exam tip: simplify the expression first, then check the exponents of the variable.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsRational ExpressionsAlgebraDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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