1. add or subtract 3/x-3-5/x-2
2.add or subtract -5/x-3/-4/x+2

Question

1. add or subtract  3/x-3-5/x-2
2.add or subtract -5/x-3/-4/x+2

pfenn1 · Answer

1.Is this the correct expression?$$-\frac{4x}{x+7}-\frac{8}{x+7} $$

anonymous · Answer

yes

pfenn1 · Answer

$$-\frac{4x}{x+7}-\frac{8}{x+7}=\frac{-4x-8}{x+7}$$

anonymous · Answer

thanks

pfenn1 · Answer

Have you tried #2?

anonymous · Answer

no

pfenn1 · Answer

2. $$\frac{3}{x-3}-\frac{5}{x-2}$$This is similar, but in order to continue, the denominators must be the same.  What is the LCD?

anonymous · Answer

i dont know

pfenn1 · Answer

Well, here is a site that helps to understand the concept of LCD.  In this case I think I would use (x-3)(x-2) as the LCD.$$\left( \frac{x-2}{x-2} \right)\frac{3}{x-3}-\left( \frac{x-3}{x-3} \right)\frac{5}{x-2}=\frac{3(x-2)-5(x-3)}{(x-2)(x-3)}$$Can you take it from here?

pfenn1 · Answer

*here is the website: http://www.mathsisfun.com/least-common-denominator.html