Mixed assessment · Question 3
5 written marks
Let \(f(x)=3x^2+12x+8\), \(x\le-2\).
Part a · 2 marks
Write the rule in completed-square form and find the range of \(f\).
Part b · 3 marks
Find \(f^{-1}\), stating its domain.
Complete-answer checking, worked solutions and indicative written criteria.
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