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

Answer and explanation

Correct answer: Because (2x-1) is inside a radical sign

In a polynomial, the variable may have only non-negative whole-number powers. The term \\(3x^2\\) satisfies this rule because its power of x is 2. However, \\(\\sqrt{2x-1}\\) contains the variable expression 2x minus 1 inside a square root. It cannot be written as an ordinary polynomial term with an allowed whole-number power of x.

A polynomial may have two terms, so having two terms is not the reason for rejection. It may also contain the number 1, and the term \\(3x^2\\) is valid. The radical term is the deciding issue; it introduces a non-polynomial dependence on x. Therefore option C correctly explains why the complete expression is not a polynomial.

Related tags

PolynomialRadicalNon Polynomial

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