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

Answer and explanation

Correct answer: Because \(\frac{1}{x^3}=x^{-3}\) gives \(x\) a negative exponent

Since \(\frac{1}{x^3}\) can be written as \(x^{-3}\), the expression contains \(x\) with exponent \(-3\). In a polynomial, the exponent of a variable must be a non-negative integer: \(0,1,2,\ldots\); negative exponents are not allowed. The absence of a constant term does not make an expression non-polynomial, so option D is not a valid reason. Exam tip: If a variable occurs in a denominator, rewrite it using a negative exponent to check whether the expression is a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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