From Förberedande kurs i matematik 1

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-	{{NAVCONTENT_START}}	+	The expression <math>-3^2</math> means <math>-(3^2)= -9</math> (and not <math>(-3)^2</math>) and so we have that
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-	{{NAVCONTENT_STOP}}	+	{{Displayed math||<math>\sqrt{-3^2} = \sqrt{-9}\,\textrm{.}</math>}}
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		+	The root expression <math>\sqrt{-9}</math> is not defined because there is no number which, when multiplied by itself, gives <math>-9</math>.

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Current revision

The expression \displaystyle -3^2 means \displaystyle -(3^2)= -9 (and not \displaystyle (-3)^2) and so we have that

\displaystyle \sqrt{-3^2} = \sqrt{-9}\,\textrm{.}

The root expression \displaystyle \sqrt{-9} is not defined because there is no number which, when multiplied by itself, gives \displaystyle -9.