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Which value is excluded from the domain of (f(x)=\frac{1}{x-3})?

Answer and explanation

Correct answer: (3)

A rational function is defined only when its denominator is not zero, because division by zero has no meaning. Here the denominator is the expression x-3. Therefore, every real number is allowed except the number that makes x-3 equal to zero. The excluded value is 3, so option C follows.

To check it directly, solve x-3=0. Adding 3 to both sides gives x=3. For any other value, the denominator is nonzero and the function has a real value. It is not necessary to exclude 0, 1, or -3, because substituting any of them leaves a nonzero denominator. Thus the domain is all real numbers except 3.

Related tags

Real-Valued-FunctionsDomainRational-Function

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