Destinyyyy
  • Destinyyyy
Memory refresher..
Mathematics
jamiebookeater
  • jamiebookeater
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Destinyyyy
  • Destinyyyy
Subtract 7-(-5+6i)-(-1-i)
welshfella
  • welshfella
be careful with the signs remember that - * + = - and -*- = + when you are distributing the negative over the 2 parentheses
Destinyyyy
  • Destinyyyy
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.

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SolomonZelman
  • SolomonZelman
Ok, you got that \(i=\sqrt{-1}\) , right?
SolomonZelman
  • SolomonZelman
or, is it just variable/
Destinyyyy
  • Destinyyyy
Yes. This is complex numbers.
welshfella
  • welshfella
the first negative is distributed about the first parentheses in the usual way
Destinyyyy
  • Destinyyyy
The one behind the 7?
SolomonZelman
  • SolomonZelman
I read that:P
ikram002p
  • ikram002p
keep real part together and terms with " i " together this is all what you need to remember :)
welshfella
  • welshfella
the one after the 7 Yes
ikram002p
  • ikram002p
i wrote art @SolomonZelman :P
SolomonZelman
  • SolomonZelman
despite that it's my 3rd language, I got good at it lately:)
SolomonZelman
  • SolomonZelman
in any case,
Destinyyyy
  • Destinyyyy
7(5-6i)-(-1-i) Now I times 7 to the first parenthesis and distribute the negative to the second correct?
welshfella
  • welshfella
if you like you can treat the - before the parentheses as -1 - so multiply everything in parentheses by -1
Destinyyyy
  • Destinyyyy
36-41i
welshfella
  • welshfella
7 - (-5 + 6i) = 7 + 5 - 6i
welshfella
  • welshfella
distributing the negative over - 5 + 6i gives + 5 - 6i
welshfella
  • welshfella
- you are not multiplying the -5 + 6i bt multiplying it by -1
welshfella
  • welshfella
* not multiplying the -5 + 6i by 7 I meant to say
Destinyyyy
  • Destinyyyy
Why not? I just get rid of the parenthesis by distributing the negative?
Destinyyyy
  • Destinyyyy
I got 13-5i
welshfella
  • welshfella
yes and the 7 isn't touched - it stays put
welshfella
  • welshfella
7 + 5 - 6i - (-1 - i) = 12 - 6t + 1 + i = 13 - 5i
welshfella
  • welshfella
right
Destinyyyy
  • Destinyyyy
okay.
welshfella
  • welshfella
good
SolomonZelman
  • SolomonZelman
actually, doesn't matter whether i is a variable or imaginary number, you get the same result.
SolomonZelman
  • SolomonZelman
well, not the same value, but a result that is recorded in the same way.

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