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How does the graph of \(y=|2x|\) change relative to the graph of \(y=|x|\)?

Answer and explanation

Correct answer: Horizontal compression; horizontal scale factor \(1/2\)

In \(y=|2x|\), the input \(x\) of the original function is replaced by \(2x\). Thus, for the same \(y\)-value, the required \(x\)-value is halved, so the graph moves toward the \(y\)-axis. This is a horizontal compression with scale factor \(1/2\). Option B is incorrect because a vertical change would result from multiplying the entire function by \(1/2\) outside the function. Exam tip: a multiplier inside the input causes a horizontal transformation, while a multiplier outside the function causes a vertical transformation.

Related tags

GraphsStandard FunctionsTransformationsHorizontal CompressionGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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