From Förberedande kurs i matematik 1

Revision as of 09:08, 9 September 2008 (edit) Tekbot (Talk | contribs) m (Lösning 3.1:2c moved to Solution 3.1:2c: Robot: moved page) ← Previous diff		Current revision (07:56, 30 September 2008) (edit) (undo) Tek (Talk | contribs) m
(One intermediate revision not shown.)
Line 1:		Line 1:
-	{{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
-	<center> [[Image:3_1_2c.gif]] </center>	+
-	{{NAVCONTENT_STOP}}	+	{{Displayed math||<math>\sqrt{-3^2} = \sqrt{-9}\,\textrm{.}</math>}}
		+
		+	The root expression <math>\sqrt{-9}</math> is not defined because there is no number which, when multiplied by itself, gives <math>-9</math>.

---

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.