anonymous
  • anonymous
perform the operations and simplify: 3x+4/x^2-16 - 2/x-4
Mathematics
jamiebookeater
  • jamiebookeater
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pfenn1
  • pfenn1
Is this your expression?\[\frac{3x+4}{x^2-2} - \frac{2}{x-4}\]
anonymous
  • anonymous
how do i solve this problem?
pfenn1
  • pfenn1
I have to go eat dinner but maybe @dpaInc can help you.

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anonymous
  • anonymous
mmm. what are we having!!! pizza?
anonymous
  • anonymous
ok.. hello?
anonymous
  • anonymous
i'm here
pfenn1
  • pfenn1
What is the LCD?
anonymous
  • anonymous
i don't know
pfenn1
  • pfenn1
well, let's try a LCD of\[(x^2-2)(x-4)\]What we get is\[\frac{3x+4}{x^2-2} - \frac{2}{x-4}=\frac{(3x+4)(x-4)-2(x^2-2)}{(x^2-2)(x-4)}\]
pfenn1
  • pfenn1
Can you multiply out the numerator?\[(3x+4)(x-4)-2(x^2-2)=\text { ?}\]
anonymous
  • anonymous
if there was an equal sign rather than the subtraction sign between the two only then you can do that. That is why this question is puzzling. you are cross multiplying...is that a legal move?
pfenn1
  • pfenn1
@mellylol, am I cross multiplying? I thought I was coming up with a LCD. What should I have done?

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