Question

How do you simplify `7i ( 3- 11i )`?

Answer 1

`77+21i`

Explanation:

For this problem we must use the fact that: `i^2 = -1`

Expanding...

`7i(3-11i) -= (7i*3)-(7i*11i)`

`=> 21i - ( 77i^2)`

`=> 21i - (-77)`

`=> 77 + 21i`