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Which transformation is applied to the graph of \(y=f(x)\) to obtain the graph of \(y=2f(x)-1\)?

Answer and explanation

Correct answer: Vertical stretch by a factor of 2, followed by a downward shift of 1 unit

In \(y=2f(x)-1\), the factor 2 outside \(f(x)\) doubles every \(y\)-value, producing a vertical stretch by a factor of 2. The term \(-1\) then shifts the entire graph 1 unit downward. It is not a horizontal stretch, because horizontal transformations involve changes inside the function’s argument, such as \(f(2x)\). Exam tip: factors outside the function affect vertical changes, while factors inside its argument affect horizontal changes.

Related tags

GraphsTransformationsStandard FunctionsVertical StretchGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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