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

See tutors like this
See tutors like this
3i(5i + 3i2) + 4 (2 - i)
3i(5i - 3) + 8 - 4i
15i2 - 9i + 8 - 4i
-15 - 9i + 8 - 4i
 
Can you combine like terms?
Upvote • 1 Downvote
More
Report

Alissa G.

Yes i can
 
Report

12/06/16

Mark M.

Good!
Report

12/06/16

Alissa G.

There is a mistake tho you didn't carry down the 3i in the ()
Report

12/06/16

Mark M.

The 3i was distributed over (5i - 3).
Report

12/07/16

Alissa G.

but it should be 9i^3
Report

12/07/16

Arturo O.

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

12/07/16

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.