Question

Which is equivalent to (3 + 2i)(3 - 2i)?

Answer 1

9 - 4i^2

Answer 2

Which is equivalent to (3 + 2i)(3 - 2i)?
A)
5
B)
6
C)
9
D)
13

Answer 3

(3 + 2i)(3 - 2i)
9-6i+6i-4i^2
9-4i^2
9+4
13

Answer 4

in complwx numbers i^2 = -1

so ist 9 - 4x(-1) = 13