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Lösung 3.1:1b

Aus Online Mathematik Brückenkurs 2

(Unterschied zwischen Versionen)
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{{NAVCONTENT_START}}
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When we remove the parentheses, the terms inside change sign,
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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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{{Displayed math||<math>3i-(2-i)=3i-2+i\,\textrm{.}</math>}}
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Then, we collect together real and imaginary parts:
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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)\\
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{{Displayed math||<math>\begin{align}
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&=-2+(3+1)i\\
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3i-2+i
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&=-2+4i\end{align}</math>
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&=-2+(3i+i)\\[5pt]
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{{NAVCONTENT_STOP}}
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&=-2+(3+1)i\\[5pt]
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&=-2+4i\,\textrm{.}
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\end{align}</math>}}

Version vom 14:47, 29. Okt. 2008

When we remove the parentheses, the terms inside change sign,

3i−(2−i)=3i−2+i.

Then, we collect together real and imaginary parts,

3i−2+i=−2+(3i+i)=−2+(3+1)i=−2+4i.
Von „http://wiki.math.se/wikis/2009/bridgecourse2-TU-Berlin/index.php/L%C3%B6sung_3.1:1b“