anonymous
  • anonymous
Add and simplify if possible:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[3 \over x-5 \] + \[5 \over x ^{2}-25\]
anonymous
  • anonymous
do u know what's special about x^2 -25?
anonymous
  • anonymous
No...

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anonymous
  • anonymous
it's something called "the difference of 2 perfect squares".
anonymous
  • anonymous
all that means is x^2 - a perfect square=(x+the square root)(x-the square root)
anonymous
  • anonymous
so x^2-25 becomes (x+5)(x-5)
anonymous
  • anonymous
Oh
anonymous
  • anonymous
k, so now u have|dw:1324334896764:dw|
anonymous
  • anonymous
multiply the 3/x-5 by (x+5)/(x+5)
anonymous
  • anonymous
that gives us a common denominator
anonymous
  • anonymous
So \[3x + 20 \over (x+5) (x-5)\]
anonymous
  • anonymous
yes!
anonymous
  • anonymous
so busy concentrating on my drawing that I couldn't see what you posted :)
anonymous
  • anonymous
@meow - see the lcm question

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