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Math Help - Combining like terms?

  1. #1
    Junior Member
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    Combining like terms?

    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!
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  2. #2
    Newbie
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    C = (3.69i + 10.14j) - (-8.312i + (-4.8)j)

    =3.69i + 10.14j + 8.312i + 4.8j

    =12.002i + 14.94j
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  3. #3
    Junior Member
    Joined
    Sep 2009
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    Alright, thanks. I was afraid of that, because I've been doing those ones wrong then...

    So, for instance, if I had say:

    (4.1i + (-3.75)j) - (1.30i + 2.25j)

    I would get:

    4.1i - 3.75j - 1.30i - 2.25j which would equal 2.8i - 6.0j?

    If I wanted to square root that would it be, then, squ.rt. of (2.8)^2 + (-6.0)^2? or would it be (2.8)^2 - (6.0)^2?

    Thanks again!
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