Additional Mathematics – Functions | e-Consult
Functions (1 questions)
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Set \(y = \sqrt{x+4}\). Squaring both sides gives \(y^{2}=x+4\), so \(x = y^{2}-4\).
Interchanging \(x\) and \(y\) provides the inverse:
\(h^{-1}(x)=x^{2}-4\), Domain: \(x\ge 2\).