anonymous
  • anonymous
what is the distance from (-7,4) to (-9,2)?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
distance= \[\sqrt{(-7+9)^2+(4-2)^2}\]
anonymous
  • anonymous
sum of the square of the differnce between x and y coordinates of the points
anonymous
  • anonymous
do the square and the square root cancel each other out?

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anonymous
  • anonymous
no no
anonymous
  • anonymous
inside the sqrt there r two terms adding up
anonymous
  • anonymous
simplify those first
anonymous
  • anonymous
sqrt(4+4)=sqrt(8) =2sqrt(2)
shadowfiend
  • shadowfiend
Right, remember you can't cancel two squares that are added together with a square root; only if they're multiplied together :)
anonymous
  • anonymous
The answer is \[2\sqrt{2} ?\]

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