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OpenStudy (anonymous):
simplify the expression (5+5i)(4+i)
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OpenStudy (anonymous):
Let's foil this just like we would if i were x. \[\begin{matrix}(5+5i)(4+i) \\ 20 + 5i + 20 i + 5 i^2\\ 20 + 25 i - 5 \\ 15 + 25 i\end{matrix}\]
OpenStudy (anonymous):
because \[i^2 = -1\]
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