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i have encountered myself with a mathematic question problem. The exercise says: The function $f$ is defined by $f:xa \sqrt{3-2x}$. Evaluate $f^{-1}(5)$. Does anyone have a clue how to resolve the equation. What does "a" represent? Does it involve the function?

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    Maybe it should be (or was) $f \colon x \mapsto \sqrt{2-2x}$. And the symbol $\mapsto$ or similar thing was confused in transcription.2011-09-25

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