Simplify: (1 + i)(1 - i)

Question

Answer
a. -2i
b. 2
c. 2i
d.-2

Answer 1

(1)(1 - i) + (i)(1 - i)
now simplify.
note: i^2=-1

Answer 2

1 - i + i -i^2 = 1 - (-1) = ?