Help with expanding

Hi, I'm a bit confused with 12(b):

I done part (a), which is:

I don't really know where to start since this expression isn't in the normal form for binomial expansion.

(edited 6 years ago)

Hi, I'm a bit confused with 12(b):

I done part (a), which is:

I don't really know where to start since this expression isn't in the normal form for binomial expansion.

\frac{1}{1-x} = (1-x)^{-1}

You should be able to expand it now and then do a similar thing for the other fraction. Please post all your working if you get stuck.

\frac{1}{1-x} = (1-x)^{-1}

You should be able to expand it now and then do a similar thing for the other fraction. Please post all your working if you get stuck.

Oh yeahh didn’t of that.

How do I expand when there’s a constant outside the brackets?

Oh yeahh didn’t of that.

How do I expand when there’s a constant outside the brackets?

3(1-2x)^{-1}=3\cdot [\mathrm{expansion \ of \ } (1-2x)^{-1}]

3(1-2x)^{-1}=3\cdot [\mathrm{expansion \ of \ } (1-2x)^{-1}]

Ooooohh how did I not think of that!! Thanks I appreciate you replying at 1am.

Edexcel A-Level Economics Paper 1 - Unofficial Mark Scheme - 18 May 2023

Writing a mathematics personal statement: expert advice from universities

Your guide to the ultimate essay

What is an LLM and how could it benefit your career?