Question

(3-9i)(3+9i) =
(Simplify your answer. Type your answer in the form a +bi.)

Answer 1

I think it’s 90
I hope it’s correct

Answer 2

`90`

Explanation:

Expand (3-9i)(3+9i) using the FOIL Method.

`3 * 3 + 3(9i) - 9i * 3 - 9i(9i)`

Simplify and combine like terms.

`90`

therefor, the answer is 90.