Complex numbers confused

[samsiexD]

This sounds silly but when it says "express to form x+yi" does that mean simplify down to simplest form? Because theres some questions that i do and i don't know how to put it in that form

E.g. 2C(i got 10) and 3C( i got 2i)

And when i do 3D and 3E i get 0 for both

Can someone tell me what im doing wrong please

[Lasercookie]

If you really wanted it to be in that form, you could say:

2c)
I would lean towards that it's probably unnecessary to write the 0i. If you plot them on an argand diagram hopefully it'll make sense why any points on the Real axis will be (x+0i) and any points on the Imaginary axis will be (0 + yi) 

With 3c and 3d:

3c) squaring the difference of z (which is z = z+i) and the conjugate of z (which is z-bar = z - i):

3d) So the conjugate of z, and then cubing it. (using bionomial thingy to expand it)

[Conic]

Beaten, but anyway.

3d:









3e:

[samsiexD]

Thank yous so much it makes a whole lot more sense now
Turns out i made minor mistakes, thanks!