cowgrl4life29 cowgrl4life29

08-11-2017
Mathematics

contestada

(2 + 5i)(2 + i)

please help me to understand how to do it

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choixongdong choixongdong

08-11-2017

(2 + 5i)(2 + i)
= 4 + 10i + 2i + 5i^2
= 4 + 12i + 5i^2

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