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

Question

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

pfenn1 · Answer

Is this your expression?$$\frac{3x+4}{x^2-2} - \frac{2}{x-4}$$

anonymous · Answer

how do i solve this problem?

pfenn1 · Answer

I have to go eat dinner but maybe @dpaInc can help you.

anonymous · Answer

mmm. what are we having!!! pizza?

anonymous · Answer

ok.. hello?

anonymous · Answer

i'm here

pfenn1 · Answer

What is the LCD?

anonymous · Answer

i don't know

pfenn1 · Answer

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 · Answer

Can you multiply out the numerator?$$(3x+4)(x-4)-2(x^2-2)=\text { ?}$$

anonymous · Answer

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 · Answer

@mellylol, am I cross multiplying?  I thought I was coming up with a LCD.  What should I have done?