$$\[ \mathrm{f}(x)=x^{2}+1 \quad \mathrm{~g}(x)=1-2 x \quad \mathrm{~h}(x)=\frac{1}{x}, x \neq 0 \quad \mathrm{j}(x)=5^{x} \]$$ Find $$\(\mathrm{g}^{-1}(x)\)$$ $$\[ \mathrm{g}^{-1}(x)= ............................................ \]$$

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