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Express $(4-5i)(-5+5i)$ in the form $a+bi$, where $a$ and $b$ are integers and $i^2 = -1.$

 Feb 21, 2021
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\((4-5i)(-5+5i) = -20-25i+20i - 25i^2 = \boxed{5 - 5i}\)

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 Feb 21, 2021

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