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# C4 - Binomial Expansion Q - Help Please - Ignore! Sorry figured it now!! Tweet

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1. C4 - Binomial Expansion Q - Help Please - Ignore! Sorry figured it now!!

I have done the expansion, getting: -

As you can see, i'm trying to do the last bit, getting 1/0.99 so I can plug in the x value.

So my question is, how to I represent 1/0.99 in the form

1 - x/10

?

Or am I barking up the wrong tree? Also, part b asks me to show that the coefficient of x^n is K(n+1)(n+2) * 1/10^n

I just tried it on x^1 and got 1/2 then plugged this into n=2 to see if it came out right and it did. Was that the correct thing to do?

Cheers,
Ross
Last edited by rosschambers1987; 14-06-2011 at 10:30.
2. Re: C4 - Binomial Expansion Q - Help Please - Ignore! Sorry figured it now!!

Then you can use your answers from the earlier parts to solve this.
Hope this helps.
Last edited by Ch1pp0; 14-06-2011 at 11:55.