Adding and multiplying complex numbers on TI-89

[Kawaisou]

Hello all,

My first post here and sorry it is not very scholarly. lol

I am currently taking Algebra 2 and am completely lost as how to find the answers to simple equations and expressions such as the ones below. Can anybody help me out or if you own a TI-89 Calc and know how to perform these operations, please let me know! I will need to do it by hand but if I can do it on the Calc I can learn better with having the answer before hand and such. Well anyway, here are the examples.

1. (4 - i) + (3 + 2i) change to standard form

2. 5i(-2 + i)

Thanks everybody!^^

 

[Mech_Engineer]

Learn how to do it by hand FIRST. Doing it on the calculator will not help in your learning process, despite what you would like to believe.

 

[robert Ihnot]

For the TI-89, you use 2nd Catalog, which has the i written above it.

 

[staticd]

I wrote a little blog post that explains exactly what you are looking for.

http://blog.ncday.net/2010/07/how-to-manipulate-complex-numbers.html"

I hope this helps!