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Which expression is a polynomial in x but includes y as a coefficient-like quantity?

Answer and explanation

Correct answer: yx³ + 2x − 5

The governing concept is that a polynomial may be considered in one specified variable while other symbols are treated as constants or parameters. In option A, yx³ + 2x − 5 is a polynomial in x: the powers of x are 3, 1, and 0, all non-negative integers. The symbol y acts as a coefficient-like parameter multiplying x³, so its presence does not violate the polynomial condition when x is the variable under consideration. Option B contains y/x = yx⁻¹, option C contains x⁻², and option D contains √x = x^(1/2). Each of those has an invalid power of x. Therefore option A is the only correct answer. If the question instead treated both x and y as variables jointly, the expression would still be a polynomial in two variables.

Related tags

Polynomial In XParameterCoefficient-Like QuantityDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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