Solution 3.1:1b
From Förberedande kurs i matematik 2
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| - | < | + | When we remove the parentheses, the terms inside change sign: |
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| + | <math>3i-(2-i)=3i-2+i.</math> | ||
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| + | Then, we collect together real and imaginary parts: | ||
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| + | <math>\begin{align}3i-2+i&=-2+(3i+i)\\ | ||
| + | &=-2+(3+1)i\\ | ||
| + | &=-2+4i\end{align}</math> | ||
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Revision as of 11:31, 18 September 2008
When we remove the parentheses, the terms inside change sign:
\displaystyle 3i-(2-i)=3i-2+i.
Then, we collect together real and imaginary parts:
\displaystyle \begin{align}3i-2+i&=-2+(3i+i)\\ &=-2+(3+1)i\\ &=-2+4i\end{align}
