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

To find the sum (z1 + z2), you simply add the real parts together and add the imaginary parts together.

So, (z1 + z2) = (8-7i) + (-4+7i)

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

= 4

Therefore, the sum of z1 and z2 is 4.