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Which statement about (x^2+\frac{x}{x}) is the most accurate?

Answer and explanation

Correct answer: It equals (x^2+1) for (x\neq0) but originally has variable in denominator

The direct answer is B, with an important domain qualification. In the original expression, x/x is defined only when x≠0, and for those values it equals 1. Thus x^2+x/x=x^2+1 for x≠0. However, the original expression is not defined at x=0, whereas the polynomial x^2+1 is defined there; so they are not exactly the same function on all real numbers. Option A is wrong because the original variable denominator prevents calling the displayed form a polynomial without qualification. Option B is correct because it states both the simplification and the restriction. Option C is wrong: the expression is not identically zero. Option D is wrong: x^2+1 has degree 2, not 1. Memory cue: never cancel x/x without recording x≠0; simplification can change the domain.

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PolynomialDomainDefinition

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