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Which expression is a polynomial with real coefficients?

Answer and explanation

Correct answer: (2.5x^2-3x+1)

A polynomial with real coefficients must have real-number coefficients and only non-negative integer powers of the variable. Real coefficients can include 2.5, because every terminating decimal is a real number. The important test is whether the variable powers are 0, 1, 2, and so on, with no variable in a denominator or under a radical.

In option A, \\(2.5x^2-3x+1\\) has real coefficients and powers 2, 1, and 0, so it is a polynomial. Option B contains \\(x^{-1}\\), option C contains the fractional power \\(x^{1/2}\\), and option D has x in the denominator. These violate the required form. Therefore, option A is correct.

Related tags

Definition-PolynomialReal-CoefficientsDecimal-Coefficient

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