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Why is (4x^3+x^{-2}+2) not a polynomial?

Answer and explanation

Correct answer: Because it contains the negative exponent \(x^{-2}\) of the variable

In a polynomial, the exponent of a variable must be 0 or a positive integer. Here, \(x^{-2}=\frac{1}{x^2}\) has a negative exponent, so the expression is not a polynomial. The exponent 3 in \(4x^3\) and the constant term 2 are allowed, and having three terms is not a problem. Exam tip: check for negative, fractional, or radical exponents of variables.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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