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Which expression is not a polynomial in x because, although all powers are integers, one power is negative?

Answer and explanation

Correct answer: x⁻³ + 2x² − 1

A polynomial requires every exponent of the variable to be a non-negative integer. Merely being an integer is not enough. In option B, the exponent −3 is an integer but it is negative. Since x⁻³ equals 1/x³, the variable occurs in a denominator, which violates the definition of a polynomial in x. Option A has exponents 4, 2 and 0; option C has 3, 1 and 0; and option D has 1 and 0. All these exponents are non-negative integers, so A, C and D are polynomials. The negative exponent is therefore the decisive reason that B is not a polynomial, making option B the unique correct answer.

Related tags

Negative ExponentPolynomial DefinitionPolynomial ConditionsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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