Solution 3.1:2c
From Förberedande kurs i matematik 1
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- | {{ | + | The expression |
- | < | + | <math>-\text{3}^{\text{2 }}</math> |
- | {{ | + | means |
+ | <math>-\left( \text{3} \right)^{\text{2}}\text{ }=-\text{9 }</math> | ||
+ | (and not | ||
+ | <math>\left( -\text{3} \right)^{\text{2}}</math> | ||
+ | ) and so we have | ||
+ | |||
+ | |||
+ | The root expression | ||
+ | <math>\sqrt{-9}</math> | ||
+ | is not defined because there is no number which, when multiplied by itself, gives | ||
+ | <math>-\text{9}</math>. |
Revision as of 10:47, 22 September 2008
The expression \displaystyle -\text{3}^{\text{2 }} means \displaystyle -\left( \text{3} \right)^{\text{2}}\text{ }=-\text{9 } (and not \displaystyle \left( -\text{3} \right)^{\text{2}} ) and so we have
The root expression
\displaystyle \sqrt{-9}
is not defined because there is no number which, when multiplied by itself, gives
\displaystyle -\text{9}.