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Which expression is not a polynomial because it contains 1/x⁴?

Answer and explanation

Correct answer: x⁴ + 1/x⁴

A polynomial in x is a finite sum of terms of the form axⁿ, where each exponent n is a non-negative integer. In option A, 1/x⁴ can be rewritten as x⁻⁴. The exponent −4 is negative, so this term violates the defining condition for a polynomial; consequently x⁴ + 1/x⁴ is not a polynomial. Option B has powers 4, 2 and 0, all allowed. Option C uses x⁰ = 1 and has powers 0 and 1, while option D has powers 3 and 0. Thus only option A is invalid. The issue is not merely that a fraction appears: numerical fractional coefficients may be allowed, but a variable in the denominator creates a negative exponent.

Related tags

PolynomialsNegative ExponentVariable In DenominatorDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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