complex number question

[FrostedNipple]

what is z

in terms of x and y

I make it x^2 + y^2 Am i right?

 

[FrostedNipple]

z.z* = (x+iy)(x-iy)

Assuming you can multiply out, Robert is your Father's brother.

yeh, when i multiply out i get x^2 +y^2 cause i get

x^2 -xiy + xiy -i^2y^2
x^2 - i^2y^2 i^2 = -1 so
x^2 - -1y^2
x^2 + y^2

 

[FrostedNipple]

well thats wierd because my father doesn't have a brother