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Which expression is not a polynomial because it has the power (-1/2) of x?

Answer and explanation

Correct answer: x^(-1/2) + 5

Option B is correct. A polynomial in x can contain only non-negative integer powers of x. The exponent -1/2 is both negative and fractional, so it is not permitted. In fact, x^(-1/2) can be rewritten as 1/√x, which places the variable in a denominator and makes the violation especially clear. The other options satisfy the exponent rule: option A has powers 2, 1, and 0; option C has powers 0 and 1; and option D has powers 3 and 0. All of those are non-negative integers. Therefore B is the only expression that is not a polynomial, and its defining defect is precisely the exponent -1/2.

Related tags

Polynomial-DefinitionExponentsNon-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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