Edexcel FP3 June 2015 - Official Thread Watch

math42
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#321
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(Original post by bwr19)
Attachment 432421

Could anyone explain how to do this question (part c)? I got 3.74 but the mark scheme says 3.61?
Form a right angled triangle with PRN, the right angle of course being at N
Use the dot product to find the cosine of the angle between PR and PN
Then your distance RN is PRsin(theta) where theta is the (acute) angle you worked out
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Ilovemaths96
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#322
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how do you verify a column vector is an eigenvector of a matrix?
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rayquaza17
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#323
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(Original post by Ilovemaths96)
how do you verify a column vector is an eigenvector of a matrix?
If the matrix is A and the column vector is v, then Av=(correspondingeigenvalue)*v
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chemlover12
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#324
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(Original post by nayilgervinho)
Can someone help me with 3b and 3c.

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf
Did you get it in the end or are you still confused?
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WelcomeToJ'sFreakShow
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#325
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#325
Anyone have any revision resources?
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simonli2575
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#326
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(Original post by ExMus)
Anyone have any revision resources?
TeeEm's resources.
http://www.thestudentroom.co.uk/show...9#post56166729
Haven't done the FP3 ones but his FP2 ones on complex numbers were pretty... complex.
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Ilovemaths96
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#327
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(Original post by rayquaza17)
If the matrix is A and the column vector is v, then Av=(correspondingeigenvalue)*v
Yeah i saw that in a textbook, but didnt seem convincing to me, i was thinking of just finding eigenvalues and corresponding eigenvectors but maybe thats unnecessary thanks anyway
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Vesniep
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#328
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#328
(Original post by physicsmaths)
Hope so. I'm in the high 50s/ low 60s in III, borderline in both . WBU what's your offer?
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How did you do in STEPI? Perhaps,if you have an S this can save you.
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TeeEm
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#329
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Any strong FP3ers out there?

Try this integration (without clues) if you are hard enough...
I will write and post solutions after my dinner (about 1 hour)
Attached files
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physicsmaths
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#330
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(Original post by Vesniep)
How did you do in STEPI? Perhaps,if you have an S this can save you.
Na prob got a 1 in I and II. Maybe a 1 in III. Most likely results is 1,1,2


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chemlover12
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#331
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(Original post by TeeEm)
Any strong FP3ers out there?

Try this integration (without clues) if you are hard enough...
I will write and post solutions after my dinner (about 1 hour)
Hm, got 8.29 (3sf) but have a feeling I made a mistake somewhere in the calculation :/
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TeeEm
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#332
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(Original post by chemlover12)
Hm, got 8.29 (3sf) but have a feeling I made a mistake somewhere in the calculation :/
Perhaps you are right...
in an exam you will be given a substitution

use 2x = -1 + 4 coshθ

Solutions in about 20 minutes
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chemlover12
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#333
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(Original post by TeeEm)
Perhaps you are right...
in an exam you will be given a substitution

use 2x = -1 + 4 coshθ

Solutions in about 20 minutes
I expanded it and then completed the square then used the sub of
x+1= ((squrt19)/2) cosh(theta)
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ninjasinpjs
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#334
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(Original post by TeeEm)
Any strong FP3ers out there?

Try this integration (without clues) if you are hard enough...
I will write and post solutions after my dinner (about 1 hour)
i got an answer but i'm far from a STRONG fp3er

update: i think im wrong, solution not complete, gonna give up at this point taking too much time =[
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TeeEm
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#335
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(Original post by chemlover12)
I expanded it and then completed the square then used the sub of
x+1= ((squrt19)/2) cosh(theta)
the method is correct
not sure if your substitution is correct.

try my substitution
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TeeEm
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#336
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#336
(Original post by ninjasinpjs)
i got an answer but i'm far from a STRONG fp3er
either you are very modest or a very good "cheater"!
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math42
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#337
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(Original post by chemlover12)
Hm, got 8.29 (3sf) but have a feeling I made a mistake somewhere in the calculation :/
got like 11.66 but not checked and owing to some of the numbers I obtained I reckon something went wrong early on; think I got the method though..

edit: by the method I mean a method.
(Original post by TeeEm)
Any strong FP3ers out there?

Try this integration (without clues) if you are hard enough...
I will write and post solutions after my dinner (about 1 hour)
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Rubgangsci
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#338
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(Original post by TeeEm)
Any strong FP3ers out there?

Try this integration (without clues) if you are hard enough...
I will write and post solutions after my dinner (about 1 hour)
I think I did it but the result is disgusting 😷
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ninjasinpjs
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#339
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(Original post by TeeEm)
either you are very modest or a very good "cheater"!
mhmm, thought i got it but the solution was wayyy too short, so had a feeling it wasn't right.

#embarrassed
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TeeEm
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#340
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(Original post by ninjasinpjs)
mhmm, thought i got it but the solution was wayyy too short, so had a feeling it wasn't right.

#embarrassed
5 minutes to both my solutions
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