Yes there is another way.
For starters, you should actually have gotten
.
This means
.
Solve these equations simultaneously to find .
I'm a little rusty with my partial fractions so I just need a refresher.
The equation is I have
Then common denominators
After this can I do where, x=-2 for example? Cause then I will get 0=-2B
And then keep plugging in values for x? Or is there another way which I complete forgot about
IF the series is meant to be the sum of what you posted in post #1 (which I corrected because of the typos) , then yes, it is a telescoping series. To realise this you need to:
1. Find the correct partial fraction decomposition.
2. Write out the first few terms ( I suggest at least the first four terms) and start cancelling in the usual way.
If you take greater care with the details you will probably have better luck in solving questions like this one.