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jmc

algebra senior

Problem

When the graph of a certain function is shifted units to the right and stretched vertically by a factor of (meaning that all -coordinates are doubled), the resulting figure is identical to the original graph.

Given that , what is ?
Solution
When the graph is shifted units to the right, the result is a graph of ; when it is then stretched vertically by a factor of , the result is a graph of . Therefore, our information about can be rendered as an equation: Applying this equation five times, we get
Final answer
3.2