Question

(4-4i)(5-5i) = ?

Answer 1

\[20-40i-20i^2\]

Answer 2

that's not an answer choice.
A) -40i
B) 40
C )-40
D) 8-48i

Answer 3

the 20 and -20i^2 cancel, don't they?

Answer 4

Yes, recall that \(i^2 = -1\), so \(-20i^2 = 20\).

Answer 5

haha... ok i is Imaginary number? thought it was a variable...