Question 4
Let \(f(x)=x^2-1\), \(x\ge0\).
Sketch \(y=f(x)\) and \(y=f^{-1}(x)\) on the same axes. Include \(y=x\) and label both endpoints.
Find all common points of the two graphs, giving exact coordinates.
Complete-answer checking, worked solutions and indicative written criteria.
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