Multiplication

=Any one who knows about expanding multiple brackets should be able to work out how we multiply complex numbers. = =(4**//i + 1)//** x (3**//i - 2)//** is **NOT** 12**//i - 2//** = =Let's use this example: = =//**(4i + 2) x (5i - 3)**// = =How else can we write this? = =**//(4i + 2) (5i - 3)//** =

=Now, you need to multiply all the different elements of the two complex numbers together. = =//**4i x 5i =**// 20i²= =//**4i x -3 =**// //-12i//= =//**2 x 5i =**// 10i= =//**2 x -3 =**// - 6= = = =**Add them up.** = =//= 20i//² //- 12i + 10i - 6// = =//= 20i//² //- 2i -6//= =//= 20(-1) - 2i - 6//= =//= -20 - 2i - 6//= =//= -26 - 2i//=

Mr Gill says: well done!