Alissa G.

asked • 12/06/16

Complex Numbers

solve 3i(5i+3i^2)+4(2-i)

1 Expert Answer

By:

Mark M. answered • 12/06/16

Tutor
5.0 (278)

Mathematics Teacher - NCLB Highly Qualified

Alissa G.

Yes i can
 
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12/06/16

Mark M.

Good!
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12/06/16

Alissa G.

There is a mistake tho you didn't carry down the 3i in the ()
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12/06/16

Mark M.

The 3i was distributed over (5i - 3).
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12/07/16

Alissa G.

but it should be 9i^3
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12/07/16

Arturo O.

Alisa,
 
9i3 = 9i(i2) = 9i(-1) = -9i,
 
which is what Mark has in his solution.  It is correct.
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12/07/16

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