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Which expression is a polynomial in x while y acts like a coefficient?

Answer and explanation

Correct answer: y^2x^3 - 4x + 6

A polynomial in x is formed from terms in which the power of x is a non-negative integer: 0, 1, 2, 3, and so on. Any other symbol, such as y, may be treated as a fixed coefficient when the expression is considered only in x. In option A, y^2 is therefore a coefficient of x^3, and the expression has x-powers 3, 1, and 0. The highest power is 3, so it is a polynomial in x of degree 3. Option B contains y/x, which introduces x^(-1); option C explicitly contains a negative power; and option D contains sqrt(x), equivalent to x^(1/2). Negative and fractional powers of x are not allowed. Hence option A is the only correct choice.

Related tags

Definition-PolynomialPolynomial-In-XCoefficient-ParameterDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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