Question

Complex numbers - simplify (question in comments)

Answer 1

try to make a common denominator first

Answer 2

or cross multiply like
a/b -c/d = (ad-bc)/bd

Answer 3

If I tell you the answer, can you tell me how to get it?

Answer 4

you don't want to do it by yourself ? i'll tell you what to do....that way you'll be able to learn how to do it.

Answer 5

Ok then... what should I do? :)

Answer 6

cross multiply like
a/b -c/d = (ad-bc)/bd

Answer 7

do you understand what i am asking you to do ?

Answer 8

like 1/a- 1/b = (b-a)/ab
1/(3+2i) - 1/(3-2i) = ... ?

Answer 9

-4i/(9+4)

Huh.. That's correct. That's what's in the answers of the book. But as embarassing as this sounds I don't really get how the cross multiplication works, haha.