Z1=(8-7i) z2=(-4+7i)

To add complex numbers, you simply add the real parts together and the imaginary parts together.

Given z1 = 8 - 7i and z2 = -4 + 7i, we add the real parts:

Real part: 8 + (-4) = 4

And add the imaginary parts:

Imaginary part: (-7)i + 7i = 0i = 0

So the sum of z1 and z2 is 4 + 0i, or simply 4.