anonymous
  • anonymous
-3-7i/7+10i
Mathematics
katieb
  • katieb
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barrycarter
  • barrycarter
Are you sure you don't mean (-3-7i)/(7+10i)?
anonymous
  • anonymous
no i dont know why everybody says there is supposed to be parentheses because thats not what the paper is its rationalizing imaginary denominators
PaxPolaris
  • PaxPolaris
\[{- 3-7i \over 7+10i}={\left( -3-7i \right)\cdot \left( 7-10i \right) \over \left( 7+10i \right) \cdot \left( 7-10i \right)}\]

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PaxPolaris
  • PaxPolaris
ps. when writing in a straight line, -3-7i/7+10i would read as:\[-3-{7i \over7}+10i\] you would use parentheses to compensate.
PaxPolaris
  • PaxPolaris
\[{\left( -3-7i \right)\cdot \left( 7-10i \right) \over \left( 7+10i \right) \cdot \left( 7-10i \right)}= {-21+70i^2+30i-49i \over 49-100i^2}\]
PaxPolaris
  • PaxPolaris
\[={-21-70-19i \over 49+100}={-91-19i \over 149}\ or\ -{91+19i \over 149}\]

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