Question

WILL MARK BRAINLIEST AND THANKS!
What is the value of the product (3 – 2i)(3 + 2i)?
5
9 + 4i
9 – 4i
13

Well... (3 - 2i)(3+2i) = (3 * 3) + (-2i * 2i) = 9 + -4i^2

i^2 = -1 so we have

9 +-4(-1)
= 9 + 4
= 13

Is my work correct here?

Answer 1

hai friend,

(3-2i)(3+2i)

as (a+b)(a-b) =a²-b²

3²-(2i)²
=9-(4*-1)
=9-(-4)
=9+4
=13

hope helped!!

Answer 2

9-4i^2
9-4(-1)^2
9-4=5