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Which option is a polynomial and all its non-zero variable terms have even powers?

Answer and explanation

Correct answer: 3x⁴ − 2x² + 9

A polynomial may contain only non-negative integer powers of its variable. The extra condition here is that every non-zero variable term must have an even exponent. In option B, the variable terms are 3x⁴ and −2x²; their exponents 4 and 2 are both even, and the constant 9 is permitted because constants have exponent 0, which is also even. Option A contains x⁵, an odd power. Option C contains x³ and x, both odd powers. Option D contains √x = x^(1/2), which is not a polynomial term because 1/2 is not an integer. Thus B is the only option satisfying both the polynomial rule and the even-power condition.

Related tags

Polynomial ClassificationEven PowersExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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