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

 May 9, 2021
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(4 - 5i)(5 + 5i)    expand

20 + 20i - 25i- 25i^2

20 -5i + 25

45-5i

 May 9, 2021

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