Question

How do you simplify `6- ( - 3+ 9i ) - ( - 6- i)`?

Answer 1

`6-(-3+9i)-(-6-i)=.........`

Remember that `1-(-1)=2`

Explanation:

`6-(-3)-(9i)-(-6)-(-i)` `=` `6+3-9i+6+i`

`=` `15-8i`.

I think that's right. It's all too easy to make an arithmetic mistake.