To divide a complex number z by a real number r is easy, just divide both the real and the imaginary parts by r to get z/r=a/r+ib/r. To divide by a complex number, z′, we can u...To divide a complex number z by a real number r is easy, just divide both the real and the imaginary parts by r to get z/r=a/r+ib/r. To divide by a complex number, z′, we can use the fact that z′∗z′=|z′|2 is real.