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anonymous

  • one year ago

Just a quick question (-9+i)-(4-i) Does it equal 13 or is it 13+i ?

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  1. freckles
    • one year ago
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    well -9-4=? and i-(-i)=?

  2. anonymous
    • one year ago
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    i is an imaginary number

  3. freckles
    • one year ago
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    I assumed so

  4. freckles
    • one year ago
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    \[(-9+i) -(4-i) \\ (-9-4)+(i-(-i))\] you still need to simplify real part and imaginary part

  5. anonymous
    • one year ago
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    So it's -13+i ?

  6. freckles
    • one year ago
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    not quite

  7. freckles
    • one year ago
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    i-(-i) is i+i

  8. freckles
    • one year ago
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    which is 2i

  9. anonymous
    • one year ago
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    Oh 2i

  10. freckles
    • one year ago
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    yes so -13+2i

  11. anonymous
    • one year ago
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    Thank you!

  12. freckles
    • one year ago
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    all i did was take the terms in the first parenthesis and put a minus sign the wrote the terms in the second parenthesis

  13. freckles
    • one year ago
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    |dw:1442268426248:dw|

  14. freckles
    • one year ago
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    anyways peace

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