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Which expression is a polynomial although it has no x-term?

Answer and explanation

Correct answer: 3x⁴ + 5

A polynomial does not need to contain every possible power of x. Missing powers simply have coefficient zero. In option A, 3x⁴ + 5 may be written as 3x⁴ + 0x³ + 0x² + 0x + 5. Its visible powers are 4 and 0, both non-negative integers, so it is a polynomial even though the x¹ term is absent. Option B contains 1/x = x⁻¹, and option C contains x⁻⁴; negative powers are not allowed in a polynomial. Option D is not the intended clear polynomial form because it is written with a variable radical and can require interpretation of √(x⁴). Thus option A is the unambiguous answer. A missing term is acceptable; an invalid exponent is not.

Related tags

Polynomial DefinitionMissing TermsNegative ExponentsIntroduction To PolynomialsClass 9 MathematicsDefinition Of A PolynomialMathematicsClass 9 Mcq

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