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

To calculate the sum and difference of complex numbers z1 and z2, we can add/subtract their real and imaginary parts separately.

Sum: z1 + z2 = (8 - 7i) + (-4 + 7i) = (8 - 4) + (-7i + 7i) = 4 + 0i = 4

Difference: z1 - z2 = (8 - 7i) - (-4 + 7i) = 8 + (-7i) + 4 - 7i = 12 - 14i

Therefore, the sum of z1 and z2 is 4, and the difference of z1 and z2 is 12 - 14i.