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

 

Plz help thx

 Feb 14, 2021
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(4 - 5i)(-5 + 5i) = (4)(-5) + (4)(5i) + (-5i)(-5) + (-5i)(5i) = -45 + 45i.

 Feb 15, 2021

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