Lösung 3.1:2c
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Version vom 14:18, 22. Okt. 2008
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.
