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Mathematics 21 Online
OpenStudy (anonymous):

what is (-i)^3?

OpenStudy (anonymous):

i

OpenStudy (anonymous):

-i \[ i^2 = -1 \] there if you multiply that by i you get \[ i^3= -i \]

OpenStudy (anonymous):

(-i)^3=(-i)^2 *i=-1*i=-i

OpenStudy (anonymous):

you have to cube the minus also

OpenStudy (anonymous):

-1 cubed is minus one.

OpenStudy (anonymous):

http://www.wolframalpha.com/input/?i=i%5E%283%29

OpenStudy (anonymous):

yes (-i)^3 is (-1*i)^3=-1*-i=i

OpenStudy (anonymous):

why is i^3 now suddenly -i ? i^3 = i^3

OpenStudy (anonymous):

i wrote exactly as in the question and got i as ans in ur link

OpenStudy (anonymous):

because the question is,,

OpenStudy (anonymous):

oh I see where you are going, thanks.

OpenStudy (anonymous):

I should read the question more carefully. (-:

OpenStudy (anonymous):

:)

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