Solving Complex Number Problems: z1 & z2

[Lmck33]

Homework Statement

Let z1 = 4 + 3i and z2 = 2 - 5i. Find each of the following in the form
x + iy, showing the details of your work:

I'll show in the photo the 2 questions i require help with.

Homework Equations

Complex numbers

The Attempt at a Solution

attempted f) 1/z^2 = z1 = 4+3i

z1 = 4/25 - 3i/25

However I'm really lost, mind blank and more so with question e) :S

Thanks for any help .

 

[╔(σ_σ)╝]

z*zbar=|z|^2.

Part e is just some real number.

Write down the expression and do the multiplication.