Complex numbers. P is a point in an Argand Diagram corresponding to a complex number z which satisfies the equation I4 + zI – I4 - zI = 6. Prove that
a) I4 + zI^2 – I4 - zI^2 ≥ 48,
b) and deduce that Re(z) ≥ 3.
i tried solving the given equation but i only get IzI greater than or equal to 3. not the real part of z...what do i do?