Additional Mathematics – Functions | e-Consult
Functions (1 questions)
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1. \(f(4)=2(4)+3=11\).
2. To obtain the inverse, set \(y=2x+3\) and solve for \(x\):
\(y-3=2x \;\Rightarrow\; x=\dfrac{y-3}{2}\).
Hence \(f^{-1}(x)=\dfrac{x-3}{2}\).