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Complete the table below, using $f(x) = \sqrt{x}\text{.}$ If an expression cannot be evaluated, write DNE (“does not exist”) in that space.

$x$	$f(x)$	$-f(x)$	$f(-x)$
$-9$
$-4$			2
$-1$
$0$
$1$		-1
$4$
$9$	3		DNE

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