Lösning 1.8.1b
Förberedande kurs i matematik
(Skillnad mellan versioner)
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- | <math>\ | + | <math>\begin{align} (3-2i)(4+i-(6-2i)) &= (3-2i)(-2+3i)=\\&=(3\cdot (-2) + 3 \cdot 3i -2i\cdot(-2) -2i\cdot 3i =\\&= -6 +9i + 4i+6=\\&=13i\end{align} |
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Nuvarande version
\displaystyle \begin{align} (3-2i)(4+i-(6-2i)) &= (3-2i)(-2+3i)=\\&=(3\cdot (-2) + 3 \cdot 3i -2i\cdot(-2) -2i\cdot 3i =\\&= -6 +9i + 4i+6=\\&=13i\end{align}