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Which expression is a polynomial in x while treating y as a constant?

Answer and explanation

Correct answer: yx² + 3x − 4

The governing concept is a polynomial in one variable when another symbol is treated as a fixed constant. For an expression to be a polynomial in x, each power of x must be a non-negative integer. The coefficients may contain y because y is being held constant. In option A, yx² + 3x − 4 has x-powers 2, 1 and 0, so it is a polynomial in x of degree 2; y simply forms part of the coefficient of x². Option B contains x^−1, since 1/x=x^−1. Option C contains the fractional power x^(1/2), and option D again contains a negative power of x. Negative and fractional exponents violate the polynomial rule. Therefore option A is the only correct answer.

Related tags

PolynomialVariable-XConstant-ParameterDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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