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Is (0.5x^2+3x-1) a polynomial in (x)?

Answer and explanation

Correct answer: Yes, because a decimal coefficient is also a real number

A polynomial may have real-number coefficients, and a terminating decimal such as 0.5 is a real number. In \\(0.5x^2+3x-1\\), the coefficients are 0.5, 3, and -1, while the powers of \\(x\\) are \\(2\\), \\(1\\), and \\(0\\). All these powers are non-negative whole numbers, so the expression meets the definition of a polynomial in \\(x\\).

Therefore, option A is correct. A decimal coefficient does not disqualify an expression; it may also be written as the fraction \\(1/2\\). Having three terms is allowed, and \\(x^2\\) is a standard polynomial power. The expression would fail to be a polynomial only if it contained a negative or fractional power of \\(x\\), or a variable in the denominator.

Related tags

PolynomialDecimal CoefficientDefinition

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