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Why is \(x^2+\frac{1}{x^3}+5\) not a polynomial?

Answer and explanation

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

In a polynomial, the exponent of a variable must be a non-negative integer, such as \(0,1,2,\ldots\). Here, \(\frac{1}{x^3}=x^{-3}\), so \(x\) has exponent \(-3\). Since the expression contains a term with a negative exponent, it is not a polynomial. Both \(x^2\) and the constant term \(5\) are allowed in a polynomial; having three terms is also not a problem. Exam tip: when a variable occurs in the denominator, rewrite it with a negative exponent to test whether the expression is a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraClass 9Definition Of A PolynomialIntroduction To PolynomialsMathematics

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