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Why is (5x^3+x^{-1}+4) not a polynomial?

Answer and explanation

Correct answer: Because it contains the term \(x^{-1}\), in which the variable has a negative exponent

In a polynomial, the exponent of a variable must be a non-negative integer such as 0, 1, 2, or 3. Here, \(x^{-1}=\frac{1}{x}\) has exponent −1, so the expression is not a polynomial. The term \(5x^3\) and the constant term 4 are both allowed in a polynomial. Exam tip: if a variable occurs in the denominator, it usually represents a negative exponent and the expression is not a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsClass 9 MathematicsAlgebraic ExpressionsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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