Question

Find the equivalent expression to the complex number (1+i)(1−i).
a.0
B.2
c.1+i
d.1-i

Answer 1

(1+i)(1-i)
1*1=1
1*-i=-i
i*1=i
i*-i=\(-i^2\)
\(-i^2=1\)
1-i+i+1
1+1
2