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Which expression is a polynomial in x but has several middle powers missing?

Answer and explanation

Correct answer: x⁸ + 3x³ − 2

A polynomial does not need to contain every power between zero and its highest power. Missing powers simply have coefficient zero, so their absence does not violate the definition. In option A, x⁸ + 3x³ − 2 has powers 8, 3 and 0; powers 7, 6, 5, 4, 2 and 1 are missing, but that is allowed. All powers that appear are non-negative integers, so the expression is a polynomial of degree 8. Option B has a negative exponent, option C has the fractional exponent 8/3, and option D contains 1/x⁸, which equals x⁻⁸. Therefore those choices are not polynomials, and option A is correct.

Related tags

Missing PowersPolynomial DefinitionDegree EightDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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