SOLUTION: 2i(-4-i)^2

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Question 1087504: 2i(-4-i)^2
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
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= 2i%2A%2816%2B8i+%2B+i%5E2%29 = 2i*(16+8i-1) = 2i*(15+8i) = 30i + 16i^2 = -16 + 30i.

Answer. -16 + 30i.


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On complex numbers, see introductory lessons
    - Complex numbers and arithmetical operations on them
    - Complex plane
    - Addition and subtraction of complex numbers in complex plane

    - Solved problems on taking roots of complex numbers
    - Solved problems on arithmetic operations on complex numbers
    - Solved problem on taking square root of complex number
in this site.

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Complex numbers".