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Question Number 190618 by mustafazaheen last updated on 07/Apr/23

$$\mathrm{f}(\mathrm{x}-\mathrm{f}\left(\mathrm{x}\right))=\mathrm{x},\mathrm{f}\left(5\right)=-1$$$$\mathrm{f}(-1)=?$$

Answered by aba last updated on 07/Apr/23

$$\mathrm{f}(5-\mathrm{f}\left(5\right))=5\Rightarrow \mathrm{f}\left(4\right)=5$$$$\mathrm{f}(4-\mathrm{f}\left(4\right))=4\Rightarrow \mathrm{f}(-1)=4$$$$$$

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