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Why is \(x^4+\frac{1}{x^2}+x\) not a polynomial?

Answer and explanation

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

In a polynomial, every exponent of the variable must be a non-negative integer. Here, \(\frac{1}{x^2}=x^{-2}\), so \(x\) has exponent \(-2\). Since a negative exponent occurs, the expression is not a polynomial. Both \(x^4\) and \(x\) are valid polynomial terms, and an expression may have three terms. Exam tip: When a variable appears in a denominator, rewrite it using a negative exponent before checking whether it is a polynomial.

Related tags

Polynomial DefinitionNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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