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# Edexcel FP1 Thread - 20th May, 2016 watch

1. (Original post by AhnafR)
How do you prove T is self inverse? Was detT = -1
Yes, it was -1. You just had to find the inverse matrix and say that it was the same, i.e. R^-1 = R .'. self-inverse.
2. (Original post by anonymousGangsta)
Both were 3 marks
Lol dude they wernt 3 marks they were 5 marks each
3. (Original post by LewisClothier)
awesome, i just saw someone put 2.03, but it's 2.23, i think they just remembered it wrong
2.03 was the arg
4. (Original post by anonymousGangsta)
Paper was p*ss, but the candidate number didn't have enough boxes for my mobile? Did they want that to text me my grade???
You idiot that's for your postcode
5. +-sqr2/2 (+-1/sqr2)
9/2*x^1/2 + 25/2*x^-3/2
12.467 (I double checked this however may still be wrong)
a=38 b=15 c=1
2-2i, -8i, p=-4 q=8
1/p
anti clockwise rotation 45 degree about (0,0) (this may be wrong)
p=-3 q=-9, matrix (0 1 (bottom line 1 0))
a^2 +2a -4 + 4i(a +1), a=-1, sqr5 and 2.03 rad, QR twice the length of OP and QR is parallel to OP
x=15sqr2/4
6. (Original post by TH3-FL45H)
2.03 was the arg
oh, yeah i got confused on that question so i put -2.03 in the heat of the moment, oopsy!
7. (Original post by AhnafR)
How do you prove T is self inverse? Was detT = -1
Basically a Matrix is self-inverse if A^2 = I so you had to times it by itself and get the identity matrix. Or at least I think.
8. (Original post by Mills.O)
You idiot that's for your postcode
9. (Original post by AhnafR)
How do you prove T is self inverse? Was detT = -1
T^-1=T
or R^-1=R

Yes I got the determinent as -1 which gave T=T^-1
10. (Original post by TH3-FL45H)
Anyone remember how many marks the last two parts of 9 were worth?

Think I lost all them marks but got the rest the paper

For the first proof by induction is it alright if I didn't do the step shown in the pic?

Attachment 535197
can't remember however it was 11 marks for the whole of Q9
11. (Original post by Person18)
Does anyone know if there's an unofficial mark scheme? I know my teachers said they can't see it until tomorrow
Doubt it's up yet, check back in a few hours but it'll probably be here today
12. (Original post by chewitt77)
+-sqr2/2 (+-1/sqr2)

2-2i, -8i, p=-4 q=8

x=15sqr2/4
think i got -9 and -3 for p and q, not sure which way round though

Edit: oops... my memory is awful xD that was for the matrix question
13. I thought the timing for this paper was quite tricky. I normally finish with about 30mins to go, but I spent all my time trying to get 5a, that I didn't have time to check1 So annoying
14. (Original post by anonymousGangsta)
MY friend found one question soo hard he put his paypal email address as the answer. Lol I saw him do it.
15. (Original post by chewitt77)
+-sqr2/2 (+-1/sqr2)
9/2*x^1/2 + 25/2*x^-3/2
12.467 (I double checked this however may still be wrong)
a=38 b=15 c=1
2-2i, -8i, p=-4 q=8
1/p
anti clockwise rotation 45 degree about (0,0) (this may be wrong)
p=-3 q=-9, matrix (0 1 (bottom line 1 0))
a^2 +2a -4 + 4i(a +1), a=-1, sqr5 and 2.03 rad, QR twice the length of OP and QR is parallel to OP
x=15sqr2/4
those are all right except the anti-clockwise rotation which was 135 degrees I believe
16. For the last question, I got 5√2－5/2√2, not in the simplest form, is that ok?
17. (Original post by midgemeister7)
those are all right except the anti-clockwise rotation which was 135 degrees I believe
Correct lol I used the formula book
18. (Original post by Sallekmo)
T^-1=T
or R^-1=R

Yes I got the determinent as -1 which gave T=T^-1
didn't know what self inverse meant, so i put ad = bc
19. For the last question, did it say the midpoint lied on the positive x axis or just that it was positive?
20. (Original post by NotNotBatman)
For the last question, did it say the midpoint lied on the positive x axis or just that it was positive?
Lied on the positive x axis so y=0

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