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Which expression is not a polynomial in x because it has a fractional power?

Answer and explanation

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

The governing definition states that every exponent of the variable in a polynomial must be a non-negative integer: 0, 1, 2, 3 and so on. Coefficients may be rational or irrational real numbers, so the presence of √2 as a constant does not disqualify an expression. Options A and B use only allowed integer exponents. Option C has x³ and the constant √2, so it is also a polynomial in x of degree 3. Option D contains x^(5/2); 5/2 is a fractional exponent rather than a non-negative integer, so this expression is not a polynomial in x. Therefore option D is correct. A negative exponent, a variable in a denominator or a radical involving the variable would similarly violate the usual polynomial definition.

Related tags

Polynomial-DefinitionFractional-ExponentNon-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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