Question

(4+2i)(1-i) when I foil this do I still multiply unlike terms such as 2i and 1?

Answer 1

foil is a mempry device for multiplication so yes

Answer 2

Yes. In order to expand (or, foil) you multiply everything in the brackets by everything else.

EX: 4*1, 4*-i, and so on.

Answer 3

(4+2i)(1-i)

4+2i
1 - i
------
4 + 2i
-4i -2i^2
-----------
4 - 2i -2i^2

Answer 4

or if you like a more left offset ...

4 + 2i
1 - i
-------
-4i -2i^2
4 + 2i

Answer 5

or if you like definitions,
\[(a+bi)(c+di)=(ac-bd)+(ad+bc)i\]

Answer 6

Ahhh I see thank you very much!