Question

Prove that if w,z are complex numbers such that |w|=|z|=1 and wz\=-1, then w+z/1+wz is a real number

I so far i have determined that w and z both have to equal less than one, but i cannot figure out how to prove this. if wz does not equal one it must mean that w and z both equal less than one. i'm not sure anything i have done is right if someone could look at this it would be amazing, thank you.
The mean of four consecutive even numbers is 15.

The greatest of these numbers is a1.

The least of these numbers is

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