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AQA FP2 HELP! (picture included)

I'm having trouble with 8iii. Any help would be greatly appreciated :smile:

(It goes without saying, don't post fully solutions)

P.S I don't use the substitution method*
P.S.S Yes I have made a stupid mistake with values for sum, product and double product of roots :colondollar:

. I just need help getting in the right form

(edited 8 years ago)

where is everybody?
something on TV?

Reply 2

JPencil

Original post by TeeEm

where is everybody?
something on TV?

Rugby maybe? I don't suppose you could help me?

Reply 3

TeeEm

Original post by JPencil

Rugby maybe? I don't suppose you could help me?

At the moment I am working on a paper and I am brain dead ...
I am sure someone will come along.

Reply 4

Absent Agent

Original post by TeeEm

where is everybody?
something on TV?

I guess because it's Saturday night

Reply 5

username1560589

Original post by JPencil

I'm having trouble with 8iii. Any help would be greatly appreciated :smile:

(It goes without saying, don't post fully solutions)

P.S I don't use the substitution method*

Substitution is the easiest method for this question.

You might want to check your values for the sum and product and double product of the original roots.

Reply 6

JPencil

Original post by morgan8002

Substitution is the easiest method for this question.

You might want to check your values for the sum and product and double product of the original roots.

I just realised the mistake with the values :/ Any help with getting the right form??

Reply 7

username1560589

Original post by JPencil

I just realised the mistake with the values :/ Any help with getting the right form??

Redo the sum and double product of the new roots by subbing in the corrected values. Then start again on the product starting from

(\alpha + \beta)(\beta + \gamma)(\alpha + \gamma)

. Try to find a way to simplify it straight away.

Reply 8

ian.slater

Original post by JPencil

I just realised the mistake with the values :/ Any help with getting the right form??

Following your method, you get terms of the form alpha^2.beta. How can you make terms like that from your building blocks ( of sum, sum of products and product) ?

Also - I'd look at your notation. You use the same Greek letters for the roots of the original equation and the different roots of your new equation. It's clear what you mean but the algebra is wrong.