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Which expression is not a polynomial because it contains \(\frac{1}{x^3}\)?

Answer and explanation

Correct answer: \(4+\frac{1}{x^3}\)

In option B, \(\frac{1}{x^3}=x^{-3}\). In a polynomial, the exponent of a variable must be 0 or a positive integer; a negative exponent is not allowed. Therefore, \(4+\frac{1}{x^3}\) is not a polynomial. In contrast, in option C, \(x^0=1\), so its exponent is not negative and it is a polynomial. Exam tip: If a variable appears in the denominator, rewrite it using a negative exponent to check whether the expression is a polynomial.

Related tags

Polynomial DefinitionNegative ExponentsAlgebraic ExpressionsGrade 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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