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What is the range of \(f(x)=\frac{2}{(x-1)^2}-3\)?

Answer and explanation

Correct answer: \((-3,\infty)\)

The range follows from the sign and limiting behavior of the expression. The domain excludes \(x=1\), and for every allowed \(x\), \((x-1)^2>0\). Hence \(2/(x-1)^2>0\), so \(f(x)=2/(x-1)^2-3>-3\). The value \(-3\) can never occur because the positive fraction can never equal zero. On the other hand, as \(x\) approaches 1, the fraction becomes arbitrarily large, so there is no upper bound. Every value greater than \(-3\) is achieved: for \(y>-3\), choose \((x-1)^2=2/(y+3)\). Thus the range is \((-3,\infty)\), making option A correct. Option B incorrectly includes the unattainable endpoint.

Related tags

RangeReciprocal-Square-FunctionStandard-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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