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Why is (x^{\frac{1}{2}}+3) not a polynomial?

Answer and explanation

Correct answer: Because it has a fractional power

A polynomial in x is built from terms whose powers of x are non-negative whole numbers such as 0, 1, 2, or 3. A constant term is allowed, addition is allowed, and the number 3 itself causes no problem. The expression x^(1/2)+3 fails the definition because the exponent of x is 1/2, a fractional number rather than a whole-number power.

The term x^(1/2) is the square root of x, and its exponent is explicitly 1/2. Therefore x^(1/2)+3 is not a polynomial in x, making option B correct. The issue is not the presence of the constant 3 or the plus sign; both are common in polynomials. For comparison, x^2+3 would be a polynomial because the powers 2 and 0 are non-negative integers.

Related tags

PolynomialFractional PowerNon Polynomial

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