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Power Equations $x^n=k$

Solve for $x$ giving exact answers.

If there are 2 solutions, separate them with a comma or use the $\pm$ symbol.
If there are no solutions, type "no solutions".

$x^2=5 \qquad x=$
$x^2=11 \qquad x=$

$x^2=-7 \qquad x=$
$x^2=-2 \qquad x=$

$x^3=7 \qquad x=$