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# Need help with (simple) algebra watch

1. Ok so I just used partial fractions and now I have to expand using the general binomial expansion.

Here is my expansion:

2(x-1)^-1 - (x+2)^-1

However I'm not really sure how to convert that into the form(s) a(1+x)^n as it only works for that form :/

Could someone help me out here please?

Thanks

Dave
2. (Original post by Davelittle)
Ok so I just used partial fractions and now I have to expand using the general binomial expansion.

Here is my expansion:

2(x-1)^-1 - (x+2)^-1

However I'm not really sure how to convert that into the form(s) a(1+x)^n as it only works for that form :/

Could someone help me out here please?

Thanks

Dave

Expand the two terms separately.

Combine the two expansions - you will need to use subtraction, hopefully you will see why.
3. (Original post by Mr M)

Unparseable or potentially dangerous latex formula. Error 4: no dvi output from LaTeX. It is likely that your formula contains syntax errors or worse.
\displaystyle (2+x)^{-1}= \left[ 2 \left[ 1+\frac{x}{2 \right] \right] ^{-1}=2^{-1} \left[ 1+\frac{x}{2} \right] ^{-1}=\frac{1}{2} (1+\frac{x}{2})^{-1}

Expand the two terms separately.

Sorry it's coming up with latex error?
4. (Original post by Davelittle)
Sorry it's coming up with latex error?
That's because I was making the brackets look nice.

Patience oh little one.
5. (Original post by Mr M)
That's because I was making the brackets look nice.

Patience oh little one.
Haha I thought it might've been something I tapped!

^.^
6. (Original post by Mr M)
That's because I was making the brackets look nice.

Patience oh little one.
Fixed! Thankyou very much. )

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