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Which expression gives the polynomial \(x^2+1\) after simplification for \(x\neq0\)?

Answer and explanation

Correct answer: \(\frac{x^3+x}{x}\)

An expression containing a variable in a denominator is not automatically a polynomial in its original form. However, when the question permits simplification under a stated restriction, common factors may be cancelled carefully. The restriction \\(x\ne0\\) is essential here because division by x is otherwise undefined.

For option A, factor or divide each term in the numerator by x: \\(\frac{x^3+x}{x}=\frac{x^3}{x}+\frac{x}{x}=x^2+1\\), provided \\(x\ne0\\). The result has powers 2 and 0, so it is the polynomial \\(x^2+1\\). The other options still contain negative powers or do not simplify to the required expression. Therefore option A is correct.

Related tags

Definition-PolynomialSimplificationValid-Polynomial

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