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Which expression is a polynomial in (x) if (y) is treated as a constant?

Answer and explanation

Correct answer: (x^2+yx+3)

Direct answer: Option A, x^2 + yx + 3. When y is treated as a constant, it behaves like a fixed number, just as 5 would. A polynomial in x may contain powers of x that are non-negative integers: 0, 1, 2, 3 and so on. In Option A, x^2 has power 2, yx has x-power 1, and 3 has x-power 0. Thus every x-power is allowed, and the expression is a polynomial in x. Option B contains 1/x = x^-1, a negative power, so it is not a polynomial. Option C contains sqrt(x) = x^(1/2), a fractional power, so it is not a polynomial. Option D contains x^-1, again a negative power, so it fails the definition even though y^2 is constant. Step by step: treat y as fixed; inspect every x-power; accept only whole numbers zero or greater; select A. Memory cue: polynomial powers of the chosen variable must be 0, 1, 2, 3,...

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Definition-PolynomialPolynomial-In-XParameter

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