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Homework Help: Sums in brackets

  1. Jan 30, 2014 #1
    Ib= (-12.4-j6.88)-(9.57-j6.38)
    Ib= -12.4-j6.88-9.57+j6.38
    Ib=(-22-j0.5)A

    Why does the -j6.38 become +j6.38?

    Ia=(9.57-j6.38)-(0.454+j13)
    Ia= 9.57-j6.38-0.454-j13

    Why does the +J13 become -J13?

    Thanks
     
  2. jcsd
  3. Jan 30, 2014 #2

    SteamKing

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  4. Jan 30, 2014 #3
    So for the top one the two minuses become a positive?
     
  5. Jan 30, 2014 #4

    SteamKing

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    Well, what is -1 * -1?
     
  6. Jan 30, 2014 #5
    It equals 1.
    Yip I get you thanks.

    Its just the way it was laid out that got me.
     
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