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Which expression is a polynomial but not a constant polynomial?

Answer and explanation

Correct answer: 7x + 3

The governing concept is the classification of polynomials by degree. A constant polynomial contains no variable term and has degree zero, while a non-constant polynomial contains a variable with a positive whole-number power. Option C, 7x + 3, uses powers 1 and 0, so it is a valid polynomial and has degree 1; it is therefore not constant. Options A, B and D are numbers without x. Each is a constant polynomial, including the zero polynomial, whose degree is treated separately in many textbooks but which is still constant. Hence option C is the only suitable answer.

Related tags

Definition Of PolynomialConstant PolynomialLinear PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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