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Destinyyyy

  • one year ago

Memory refresher..

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  1. Destinyyyy
    • one year ago
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    Subtract 7-(-5+6i)-(-1-i)

  2. welshfella
    • one year ago
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    be careful with the signs remember that - * + = - and -*- = + when you are distributing the negative over the 2 parentheses

  3. Destinyyyy
    • one year ago
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    Im assuming that your talking about the minus sign between the two parenthesis. The part that has me a bit stuck is the 7-. I know how to distribute the negative sign to others.

  4. SolomonZelman
    • one year ago
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    Ok, you got that \(i=\sqrt{-1}\) , right?

  5. SolomonZelman
    • one year ago
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    or, is it just variable/

  6. Destinyyyy
    • one year ago
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    Yes. This is complex numbers.

  7. welshfella
    • one year ago
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    the first negative is distributed about the first parentheses in the usual way

  8. Destinyyyy
    • one year ago
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    The one behind the 7?

  9. SolomonZelman
    • one year ago
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    I read that:P

  10. ikram002p
    • one year ago
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    keep real part together and terms with " i " together this is all what you need to remember :)

  11. welshfella
    • one year ago
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    the one after the 7 Yes

  12. ikram002p
    • one year ago
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    i wrote art @SolomonZelman :P

  13. SolomonZelman
    • one year ago
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    despite that it's my 3rd language, I got good at it lately:)

  14. SolomonZelman
    • one year ago
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    in any case,

  15. Destinyyyy
    • one year ago
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    7(5-6i)-(-1-i) Now I times 7 to the first parenthesis and distribute the negative to the second correct?

  16. welshfella
    • one year ago
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    if you like you can treat the - before the parentheses as -1 - so multiply everything in parentheses by -1

  17. Destinyyyy
    • one year ago
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    36-41i

  18. welshfella
    • one year ago
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    7 - (-5 + 6i) = 7 + 5 - 6i

  19. welshfella
    • one year ago
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    distributing the negative over - 5 + 6i gives + 5 - 6i

  20. welshfella
    • one year ago
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    - you are not multiplying the -5 + 6i bt multiplying it by -1

  21. welshfella
    • one year ago
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    * not multiplying the -5 + 6i by 7 I meant to say

  22. Destinyyyy
    • one year ago
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    Why not? I just get rid of the parenthesis by distributing the negative?

  23. Destinyyyy
    • one year ago
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    I got 13-5i

  24. welshfella
    • one year ago
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    yes and the 7 isn't touched - it stays put

  25. welshfella
    • one year ago
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    7 + 5 - 6i - (-1 - i) = 12 - 6t + 1 + i = 13 - 5i

  26. welshfella
    • one year ago
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    right

  27. Destinyyyy
    • one year ago
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    okay.

  28. welshfella
    • one year ago
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    good

  29. SolomonZelman
    • one year ago
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    actually, doesn't matter whether i is a variable or imaginary number, you get the same result.

  30. SolomonZelman
    • one year ago
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    well, not the same value, but a result that is recorded in the same way.

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