9709 P13 - Jun 2019 - Q11II - 3 marks
366
The function \(f\) is defined by \(f(x) = x^2 - 4x + 8\) for \(x \in \mathbb{R}\). Find the set of values of \(x\) for which \(f(x) < 9\), giving your answer in exact form.
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