Answer:
i is always positive
Step-by-step explanation:
if be multiply 3 by 3 and get 9, then you multiply -2i by 2i and get -4i squared
9-4i^2 is now easy to solve unless we do now know the value of i, but since i is squared, i is always positive
Answer:
13
Step-by-step explanation:
Assuming this is (3-2i)(3+2i)
Use the FOIL method
First: 3(3) = 9
Outter: 3(2i) = 6i
Inner: -2i(3) = -6i
Last: -2i(2i) = -4i²
Add all of them together:
9 + 6i - 6i - 4i²
= 9 - 4i² = 9 - 4(-1) = 9 + 4 = 13
*NOTE that i² = -1
