How do you multiply -11i(3+9i)?

2 Answers
Apr 20, 2018

-33i+99

Explanation:

Given: -11i(3+9i)

=-11i*3-11i*9i

=-33i-99i^2

=-33i-99*-1

=-33i+99

Apr 20, 2018

99 - 33i

Explanation:

use "distributive law"

-11i(3 + 9i) -> (-11i xx3) + (-11i xx9i)

-33i + (-99 xx i^2) *TIP) i^2 = -1

-33i + 99

:. -11i(3+9i) = 99 - 33i