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How does y = f(3x) change from y = f(x)?

Answer and explanation

Correct answer: Horizontal compression by a factor of 3

A multiplier applied inside the input causes a horizontal transformation. Suppose (u, f(u)) is a point on the original graph y = f(x). For the new graph y = f(3x) to have the same output f(u), we require 3x = u, so x = u/3. The new point is therefore (u/3, f(u)); its horizontal distance from the y-axis becomes one-third of the original distance. Consequently, the graph is compressed horizontally toward the y-axis by a factor of 3. The output values do not change, so there is no vertical stretch. A right shift would involve f(x − 3), and an upward shift would involve f(x) + 3. Thus option A is correct.

Related tags

Graph-TransformationsHorizontal-CompressionFunctionsStandard-GraphsRelations And FunctionsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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