Answer:

Step-by-step explanation:
Given

Required
Determine the inverse function
Start by replacing f(x) with y

Swap the positions of y and x

Make y the subject: <em>Add 4 to both sides</em>


Make y the subject: <em>Divide through by 2</em>
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Replace y with f-1(x)

Multiply the length by the width and your answer will be there.