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Why is \(x^3+\frac{1}{x^2}\) not a polynomial?

Answer and explanation

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

In a polynomial, the exponent of every variable must be a non-negative integer. Here, \(\frac{1}{x^2}=x^{-2}\), so the exponent of \(x\) is \(-2\). Since this exponent is negative, the expression is not a polynomial. The term \(x^3\) is valid, and a polynomial does not need to have a constant term. Exam tip: check the exponent of each variable before identifying an expression as a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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