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# Edexcel FP2 Official 2016 Exam Thread - 8th June 2016 watch

1. Zacken

Hi for (z+1)^3 = -1,

the roots of z do not equal 0 can you expalin why pls, is it because there is a constant attached to z?
2. https://8fd9eafbb84fdb32c73d8e44d980...lZweHc/CH3.pdf

Someone explain Page 61 part c, how did they come to the conclusion of working out the points and radius pls
3. (Original post by Mihael_Keehl)
Zacken

Hi for (z+1)^3 = -1,

the roots of z do not equal 0 can you expalin why pls, is it because there is a constant attached to z?
What do you mean? Are you saying that one of the roots should be z=0?

That's obviously not possible since (0+1)^3 = 1^3 =/= -1
4. (Original post by Zacken)
What do you mean? Are you saying that one of the roots should be z=0?

That's obviously not possible since (0+1)^3 = 1^3 =/= -1
no lmfao, I did not mean that, that is obvious haha.

I mean the sum of the roots of unity do not equal zero, as what is the case for other types where z is isolated in FP2 Chapter 3 Ex3E.
5. (Original post by Mihael_Keehl)
no lmfao, I did not mean that, that is obvious haha.

I mean the sum of the roots of unity do not equal zero, as what is the case for other types where z is isolated in FP2 Chapter 3 Ex3E.
Because these aren't the roots of unity - they're the roots of -1. The roots of unity are the roots of 1...
6. (Original post by Zacken)
Because these aren't the roots of unity - they're the roots of -1. The roots of unity are the roots of 1...
don't most of the roots in fp2 dmt types have the roots add up to zero, I have obeserved this serveral times..
7. (Original post by Mihael_Keehl)
don't most of the roots in fp2 dmt types have the roots add up to zero, I have obeserved this serveral times..
They probably add to -3 in this case. Because
8. (Original post by EricPiphany)
They probably add to -3 in this case. Because
I think it is just -2.
9. (Original post by Mihael_Keehl)
I think it is just -2.
That's weird. What did I do wrong?
10. (Original post by Mihael_Keehl)
I think it is just -2.
It's -3. I just checked it.
11. (Original post by EricPiphany)
It's -3. I just checked it.
(Original post by Mihael_Keehl)
I think it is just -2.
I agree with Eric, the solutionbank lists the wrong answer down at the end.
12. Please could someone explain for the method of differences how you know what cancels when there's 3 parts to the partial fraction, like in question 20b here https://8fd9eafbb84fdb32c73d8e44d980...ZweHc/REV1.pdf I can see it's obvious when the question has 2 terms but I can't figure it out when there's 3?
Thanks
13. (Original post by EricPiphany)
It's -3. I just checked it.
the roots are -2, -1/2 + isqrt3 /2 and 1/2 - isqrt3 /2 according to the document.

However I get a different answer, I was reading off the previous document before Lol.
14. (Original post by economicss)
Please could someone explain for the method of differences how you know what cancels when there's 3 parts to the partial fraction, like in question 20b here https://8fd9eafbb84fdb32c73d8e44d980...ZweHc/REV1.pdf I can see it's obvious when the question has 2 terms but I can't figure it out when there's 3?
Thanks
when you write enough of the columns at most when you have 5 rows, you will observe a pattern and then you cancel accordingly.
15. From ex 7b 5b

can we express 4/(1+sin2x) in terms of cosecx?

Why can it not be written as 4 (1+ cosec2x)
16. Page 7 part c

I put 3/sqrt2 [cosec (45 - theta)] is that acceptable?
17. (Original post by Mihael_Keehl)
From ex 7b 5b

can we express 4/(1+sin2x) in terms of cosecx?

Why can it not be written as 4 (1+ cosec2x)
18. (Original post by Zacken)
I see, thnk you
19. Hi, please could someone explain how you find the area in question 63 of rev 2 https://8fd9eafbb84fdb32c73d8e44d980...ZweHc/REV2.pdf, is there a general method to follow when finding areas of overlapping regions? Thanks
20. (Original post by economicss)
Hi, please could someone explain how you find the area in question 63 of rev 2 https://8fd9eafbb84fdb32c73d8e44d980...ZweHc/REV2.pdf, is there a general method to follow when finding areas of overlapping regions? Thanks
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