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- Dec 10th 2007, 08:41 AM #1

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- Dec 2007
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## Help please! thnk u

I have being doing an old maths test paper to practise and i have done most of it but i am struggling with these last few Q's and i just cnt figure then out! its stressing me out! lol Any help will be much appricated thnx

1) I need to make C the subject of this formula... P= C

_____

C+4

2) We have practised doing algebracic long division, and from x^3+3x+k divided by x-1,it has a reminder of 6. But from this how can i find k?

3)finally, a circle intersepts the line with equation x+y=3 at 2 points, A and B. How can i algebraically find the coordinates of A and B.

and also show that the distance AB is squareroot 162

Thank you!! to everyone that helps!

- Dec 10th 2007, 08:44 AM #2

- Dec 10th 2007, 08:46 AM #3

- Dec 10th 2007, 08:47 AM #4

- Dec 10th 2007, 08:53 AM #5
P(C + 4) = C

PC + 4P = C

4P = C - CP

4P = C(1 - P)

Okay, you said the equation is:

And we are told that

So x = 6 or x = -3

Set those values back into the circle's equation to find the corresponding y-values.

When you have those, use the distance formula to find the length of AB.

- Dec 10th 2007, 08:56 AM #6

- Dec 10th 2007, 09:07 AM #7