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Which expression is not a polynomial because the variable is present in the denominator?

Answer and explanation

Correct answer: (x^2 + 4)/x

For an expression to be a polynomial in x, every power of x must be a non-negative integer, and x must not occur in a denominator. In option B, divide each term in the numerator by x: (x² + 4)/x = x + 4/x = x + 4x⁻¹. The term 4x⁻¹ has a negative exponent, so the expression is not a polynomial. Thus option B is correct. Option A has powers 2, 1, and 0, making it a quadratic polynomial. Option C has the valid powers 3 and 0, so it is a cubic polynomial. In option D, x⁰ = 1, so the expression becomes 1 + 3x, a linear polynomial. The essential issue is the variable denominator, not the mere appearance of a fraction.

Related tags

Definition-Of-PolynomialDenominatorNegative-PowerIntroduction To PolynomialsMathematicsClass 9 McqDefinition Of A Polynomial

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