This is for a physics question, but I figured since it was math-based, I might be able to post it here. The problem that I'm having is combining like terms - I know it's simple but for some reason I've forgotten.

Here's my problem:

I solved it up until here. Now I'm stuck.

C = (3.69i + 10.14j) - (-8.312i + (-4.8)j)

If only the 'i' terms can be combined with 'i' terms, and the 'j' terms only with 'j' terms, how would I do this?

Would it be 3.69i -(-8.312i) which would give me a positive answer or just 3.69i(-8.312i) where I ignore the '-' in between the two brackets (and subtract later) which would give me a negative answer?

Thanks for any help!