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Which (x)-value is not allowed in the graph of (f(x)=\frac{1}{x})?

Answer and explanation

Correct answer: (x=0)

The direct answer is C: x=0. A function containing 1/x is defined only when its denominator is non-zero. Therefore we require x≠0. At x=0, the expression becomes 1/0, which has no real value, so the point is not part of the graph. Option A, x=1, is allowed because 1/1=1. Option B, x=-1, is allowed because 1/(-1)=-1. Option C is correct because x=0 makes the denominator zero. Option D, x=2, is allowed because 1/2 is a valid real number. The domain is all real numbers except zero, written as ℝ\{0}, and the graph has two branches with x=0 as a vertical asymptote. Always inspect denominators before accepting a value. Do not confuse an excluded input with an output: y=0 is also never obtained, but the question asks which x-value is forbidden. Exam cue: denominator zero means undefined, so remove that input from the domain.

Related tags

Relations-FunctionsStandard-GraphsReciprocal-Function

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