Question

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

Answer 1

Answer:

$90$

Step-by-step explanation:

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

$3 \times 3 + 3(9i) - 9i \times 3 - 9i(9i)$

Simplify and combine like terms.

$90$

therefor, the answer is 90.

Answer 2

I think it’s 90
I hope it’s correct