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Which expression is not a polynomial because x is in the denominator?

Answer and explanation

Correct answer: (x + 5) / x

The governing concept is the definition of a polynomial: the variable may have only non-negative integer powers, and it cannot occur in a denominator after the expression is written in standard form. Option B gives (x + 5)/x = 1 + 5/x = 1 + 5x⁻¹. The exponent −1 is not a non-negative integer, so this expression is not a polynomial. In the other displayed options, the same non-zero expression appears in numerator and denominator, so each simplifies to the constant 1 on its domain and is therefore a polynomial expression after simplification. Thus B is the intended and unambiguous answer.

Related tags

Definition Of PolynomialDenominatorNegative PowerDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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