Question

What is the answer to (1-2i)(1+2i) in the form of a+bi?

Answer 1

`5+0i`

Explanation:

`(1-2i)*(1+2i)`

=`1^2-(2i)^2`

=`1-4i^2`

=`1-4*(-1)`

=`1+4`

=`5=5+0i`