You can make the last part a bit simpler by factorising as . Then you'll want .
i still cant get the correct answer for this,i simply equated coefficients etc anad got as far as the first two terms in the answer. The question is basically
Q express in partial fractions ?[/quote]
supposed working,,
I'd start it that way. You can try and finish it.
In this case:
Since this is an identity, it is true for all values of x (this is a great help in determing the values of A,B,C,D and E!).[/quote] i miust be doing something awfully wrong
Hi, thanks for your reply and your method works but i can't help to not understand why it doesnt work when i use the partial fractions,
Using this u can quickly deduce B=1,,,and C=2/3 by elimiting their factors but then when i put in x=1,,i get -2/3=2(A+D+E)
,,,E=-1/3
,,,A+D=-2/3 which then gives me(putting these together):2A+2D=0
I know A must be zero and D cant be zero as the answer to this question is
NB previous post was 1 - p(x)/q(x) IF SOMEONE COULD HELP THEYD BE REALLY COOL!!!!XD
You seem to be doing it mostly correctly. There must be a simple arithmetic error somewhere. Starting from
,
you get B=1 and C=2/3 (by putting x=0 and x=-1). So the identity becomes
.
Now compare the coefficients of x on both sides, to get A=0, so the identity becomes
.
Next, compare the coefficients of on both sides, to get , so the identity becomes
.
Now you can wrap it up by putting x=1 (say) to get an equation for E.