The document explains the solution to the complex number expression (i+j)^2, noting that i and j represent the same imaginary unit. It simplifies the expression to (2i)^2 or (2j)^2, leading to a result of -4. This outcome arises from multiplying 2*2 to get 4 and using the property that i^2 = -1.

1. Need to solve complex numbers
(i+j)^2
Solution
i and j are not different they are one and the same used for the representation of imaginary
numbers in a complex number
so the given expression can be written as (2i)^2 or (2j)^2
which results in -4
(as the product of 2*2 is 4 and i^2 =-1 )