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$\sqrt{x^2}$ is $x$ if and only if $x\in\mathbb{R}$. See illustration on Sagecell.

$\sqrt{x^2}$ is $x$ if and only if $x\in\mathbb{R}$. See illustration on Sagecell.

$\sqrt{x^2}$ is $x$ if and only if $x\in\mathbb{R}$. $x> 0$. See illustration on Sagecell.

$\sqrt{x^2}$ is $x$ if and only if $x> 0$. See illustration on Sagecell.