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

 Aug 4, 2021
 #1
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(4-5i) (-5-5i)      expand

-20 -20i +25i + 25i2         simplify    (remember i= - 1 )

-20 -25     -20i+25i

    -45 + 5i

 Aug 4, 2021

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