If $g:\mathbb{R}\to\mathbb{R}$ is defined by $g(x)=x^{2}-2$, then the value of…

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If $g:\mathbb{R}\to\mathbb{R}$ is defined by $g(x)=x^{2}-2$, then the value of $g^{-1}(23)$ is

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Solve $x^{2}-2=23 \Rightarrow x^{2}=25 \Rightarrow x=\pm5$.

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