SOLUTION: how do i solve 5i-(-15i)

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Question 129031: how do i solve 5i-(-15i)
Answer by cngriffith(27) About Me  (Show Source):
You can put this solution on YOUR website!
5i-(-15i)=20i
Two negative signes together without any number between them equals a positive sign. This problem becomes 5i+15i which equals 20i.