posted by Anonymous .
Here are my answers. Can you check if I got the right answers? Thank you!
1/(x+h) - 1/x= -h/(x^2+xh)
[1/(3+x) - 1/3]/x= -1/(9+3x)
2x/(x^2-6x+9) - 1/(x+1)- 8/(x^2-2x-3)= (x^2+15)/(x^3-5x^2+3x+9)
first 3 look ok
In the last one I would not have expanded the denominator, leave it as