Respuesta :
so the conjugate will be 1-2i
(1+2i)(1-2i) = 1 -(2i)^2 = 1 - 4(-1) = 1+4 = 5
hope this will help you
(1+2i)(1-2i) = 1 -(2i)^2 = 1 - 4(-1) = 1+4 = 5
hope this will help you