Edexcel FP3 June 2015 - Official Thread

Could someone explain what their method would be for part (d) of this question please? Here was my method but it was fairly algebra-heavy and I'm rusty on vectors so I'm wondering if there's an easier way:

Find the plane that l2 lies in by using r.n=b.n (plane has same normal vector but passes through B)
Sub components of D into Cartesian equ of this plane to get a linear equation with a in terms of b
Use Pythagoras with the given distance and sub in previous equation to get a quadratic in terms of b
Solve for b then sub back into equation for a.

I-zero = the integral of one (limits of 0 --> sqrt3)

I forgot about the limits, now I feel stupid. Thanks for the help

This is what i did (hopefully correct)

Find AC, use this as direction vector of l2, form equation of line with this and point B.

Since B lies on this line, equate vector B to L2 to get a=3 and b = -6?

Is that right?

This is what i did (hopefully correct)

Find AC, use this as direction vector of l2, form equation of line with this and point B.

Since B lies on this line, equate vector B to L2 to get a=3 and b = -6?

Is that right?

Does anyone know of any more questions I can do? I've done all of the past papers and the pdf that has al the relevant questions from 2002-now, I don't think doing the same questions over again is too effective..

Check out http://mathematics-solutions.co.uk/EdexcelDirectory/index.php for pre 2000 spec questions :P

FP3 and S2 at the same time. Why?

Haha right??? Especially silly as most people taking S2 are further mathematicians so are likely to be doing FP3 as well! They should have put S2 on same day as M5 or even have FP3 tomorrow or something...

Don't you mean today?

Yeah haha, forget what day it is without regular school

Cant even be bothered for this exam tbh.


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How was STEP III?

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Pretty ****


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Sounded like you banged step II tho