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Which expression is not a polynomial because the power of the variable is not an integer?

Answer and explanation

Correct answer: x^(5/2) + 3x

The governing rule is that every exponent of the variable in a polynomial must be a fixed non-negative integer. Option C contains x^(5/2), whose exponent 5/2 is fractional and therefore is not an integer. It may also be written as x²√x, but that equivalent form still contains a fractional power of x, so it does not become an ordinary polynomial. Hence option C is correct. Option A uses exponents 7 and 0, option B uses exponent 0 for its variable term, and option D uses exponents 3 and 1. All of these are non-negative integers, so those expressions are polynomials. The fact that an exponent is positive is not enough; it must specifically be an allowed whole-number exponent.

Related tags

Definition-Of-PolynomialFractional-ExponentExponent-ConditionIntroduction To PolynomialsMathematicsClass 9 McqDefinition Of A Polynomial

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