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

Answer and explanation

Correct answer: Because \(\frac{1}{x^2}=x^{-2}\) gives \(x\) a negative exponent

In a polynomial, the exponent of each variable must be a non-negative integer, such as \(0,1,2,\ldots\). Here, \(\frac{1}{x^2}=x^{-2}\), so \(x\) has exponent \(-2\). Hence, the given expression is not a polynomial. Having no constant term is not a problem; for example, \(x^2+x\) is a polynomial. Exam tip: When a variable occurs in the denominator, rewrite it using a negative exponent and check it.

Related tags

Polynomial DefinitionNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsVariables In DenominatorDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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