Qualification > Math

C2 DOUBT edexcel

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halosh92:

--- Quote from: AS panic attack on April 16, 2010, 02:56:48 pm ---A=1, (5+or-sqrt 105)/8

please show workings i need to know how to get da ans

Thanks


--- End quote ---
which paper is this?

Amr Fouad:

--- Quote from: AS panic attack on April 16, 2010, 12:24:15 pm ---can sme one solve this ques

the coefficient of x3 in the epansion of (2+x)(3-ax)4 is 30
find the values of the constant a.

please show step by step working
Thanks

--- End quote ---

here u go..:)

@halosh, i answered ur angle question, check the post

halosh92:

--- Quote from: ~ A.F ~ on April 16, 2010, 03:41:49 pm ---here u go..:)

@halosh, i answered ur angle question, check the post

--- End quote ---

 thx AF  but i did the whole thing its correct except when i got stuck at solving the cubic function..how do i do that?

past-papers:
For C2, you will always get easy cubics and thus you will always be able to find one factor!!

In this case, you can see that if a=1 the equation is equal so you realise that (a-1) is a factor.

now divide by (a-1) and you will get a quadratic which you can easily factorise again...

halosh92:

--- Quote from: past-papers on April 16, 2010, 03:51:46 pm ---For C2, you will always get easy cubics and thus you will always be able to find one factor!!

In this case, you can see that if a=1 the equation is equal so you realise that (a-1) is a factor.

now divide by (a-1) and you will get a quadratic which you can easily factorise again...

--- End quote ---

thx aloot ;D ;D
but isnt this a C2 question?

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