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Functions and transformations 2

This applet shows the graphs of f(x) and g(x), where g(x) = k f(x). So when k = 2, g(x) = 2 f(x) = 2 x^2.

Change k. Change a to move P.
Describe the geometric relationship between f(x) and g(x).
What is the relationship between PR, QR and k?
What about when k = -1?