## catgirl17 Group Title perform the operations and simplify: 3x+4/x^2-16 - 2/x-4 2 years ago 2 years ago

1. pfenn1 Group Title

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

2. catgirl17 Group Title

how do i solve this problem?

3. pfenn1 Group Title

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

4. dpaInc Group Title

mmm. what are we having!!! pizza?

5. dpaInc Group Title

ok.. hello?

6. catgirl17 Group Title

i'm here

7. pfenn1 Group Title

What is the LCD?

8. catgirl17 Group Title

i don't know

9. pfenn1 Group Title

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 Group Title

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

11. mellylol Group Title

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 Group Title

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