Question

I need help with a complex number zeros/poles difference equations kinda thing
http://i42.tinypic.com/3585rtx.png

Answer 1

www.mathway.com

Answer 2

and i be back

Answer 3

is z given ?

Answer 4

z is a variable

Answer 5

I expanded the top, not even close to getting 0.1765 z ^ -1

Answer 6

you can use De Moivre's theorem
\[z ^{-n} = r ^{-n}[\cos(n \theta)-jsin(n \theta)]\]

Answer 7

that gives me 1

Answer 8

can you use MATLAB ?

Answer 9

nvm i found the answer! just needed to fully expand it and it works itself out
thx for help!!!