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catgirl17

  • 2 years ago

perform the operations and simplify: 3x+4/x^2-16 - 2/x-4

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  1. pfenn1
    • 2 years ago
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    Is this your expression?\[\frac{3x+4}{x^2-2} - \frac{2}{x-4}\]

  2. catgirl17
    • 2 years ago
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    how do i solve this problem?

  3. pfenn1
    • 2 years ago
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    I have to go eat dinner but maybe @dpaInc can help you.

  4. dpaInc
    • 2 years ago
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    mmm. what are we having!!! pizza?

  5. dpaInc
    • 2 years ago
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    ok.. hello?

  6. catgirl17
    • 2 years ago
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    i'm here

  7. pfenn1
    • 2 years ago
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    What is the LCD?

  8. catgirl17
    • 2 years ago
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    i don't know

  9. pfenn1
    • 2 years ago
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    well, let's try a LCD of\[(x^2-2)(x-4)\]What we get is\[\frac{3x+4}{x^2-2} - \frac{2}{x-4}=\frac{(3x+4)(x-4)-2(x^2-2)}{(x^2-2)(x-4)}\]

  10. pfenn1
    • 2 years ago
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    Can you multiply out the numerator?\[(3x+4)(x-4)-2(x^2-2)=\text { ?}\]

  11. mellylol
    • 2 years ago
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    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?

  12. pfenn1
    • 2 years ago
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    @mellylol, am I cross multiplying? I thought I was coming up with a LCD. What should I have done?

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