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If (f(x)=\frac{x+1}{x^2-5x+6}), what is the domain?

Answer and explanation

Correct answer: ( \mathbb{R}\setminus{2,3} )

The domain is all real numbers except 2 and 3, so option A is correct. A rational function is defined whenever its denominator is not zero. Here the denominator is x²−5x+6. Factor it: x²−5x+6=(x−2)(x−3), because −2−3=−5 and (−2)(−3)=6. Set the denominator equal to zero: (x−2)(x−3)=0, so x=2 or x=3. These two values must be excluded; every other real number is allowed. Therefore the domain is R\{2,3}. Option A states exactly this. Option B excludes −2 and −3, but those values do not make the denominator zero. Option C, all real numbers, wrongly includes values where division by zero occurs. Option D, {2,3}, gives only the excluded values rather than the allowed values. Exam cue: for a fraction function, factor the denominator and remove its zeroes; the numerator does not restrict the domain unless another condition is given.

Related tags

Relations-FunctionsDomain-RangeHardLevel-32

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