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# Edexcel FP1 Thread - 20th May, 2016 watch

2. (Original post by iMacJack)
Jan 15 IAL F1 4C
Sorry took awhile. Two methods. I'd prefer the second, but most would go for the first

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3. Question.

When you differentiate a parabola (so something with the equation y2 = 4ax) would you always make the differential a +/- or would you put it as simply a +? Because if leaving it just as a +, it gives you just one equation when you plug in, because obviously there is just one gradient.. But a +/- makes more sense.

Anyone mind clearing this up?
4. (Original post by kingaaran)
Sorry took awhile. Two methods. I'd prefer the second, but most would go for the first

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Thank you!

I don't understand the first method though... - why is it 1/2 * (18-3)* whatever?

Where does the 18-3 come from?

Cheers!
5. Yeah I'm doing FP1 tomorrow, not done Fp2 or 3 yet, the loci I cannot do haha. I think I've just about got the first part to the question - I've derived one of the coordinates haha, but nothing that complex is going to come up (I hope) so I think Im gonna just leave it. I'd love to do FP3 next year though, although our teacher is encouraging us to do M3 instead (as he teaches physics) so I guess I'll see Best luck in the exam!
6. (Original post by connorbarr)
Just draw a diagram, find the gradients of SP and SQ and u will see that they are perpendicular, then its just half the area of the rectangle using length of a line formula to work out the lengths
Thanks! Makes sense, although I wouldn't think to work out those gradients in the exam :/
7. (Original post by iMacJack)
Thank you!

I don't understand the first method though... - why is it 1/2 * (18-3)* whatever?

Where does the 18-3 come from?

Cheers!
Because the normal crosses the x axis, when y = 0, so we work out 18 by subbing y=0 into (a).

Then, we know that the area of a triangle is 1/2 * b*h, so the base of both triangles is (18-3) and the height is the other number i multiplied on
8. (Original post by Zacken)
sum frm r=1 to 12 of 2^r = 2^1 + 2^2 + 2^3 + ...

first term is 2^1 = 2.
cheers
9. Good luck everyone.
10. GL everyone!
11. (Original post by TheMoon)
yeah sorry, I used p=3 for some reason when getting the x coordinate. not sure then

There has to be an easier way though.
(Original post by WhatIsSleep)
Maybe it's something that's not on the UK FP1 spec :/
Solution on post 940
12. Are the IAL papers necessary?

I find them exceptionally difficult, but am able to complete the normal fp1 papers.

13. (Original post by TrueDAN)
That is a beastly question haha!! Just done the first part now! How far have you got?
Not very far at all, only got the equation! Please could you post your working for it have you done part b? Thanks
14. (Original post by Hot&SpicyChicken)
Are the IAL papers necessary?

I find them exceptionally difficult, but am able to complete the normal fp1 papers.

They're written by the same people, so, apart from the bits of roots, everything else has the potentiality to make an appearance in a standard FP1 Paper
15. Here you go mate.
16. Good luck all
17. (Original post by kingaaran)
They're written by the same people, so, apart from the bits of roots, everything else has the potentiality to make an appearance in a standard FP1 Paper
Can you properly explain to me how to do sigma r=0 to r=n with some examples. I still dont get it....
18. (Original post by fpmaniac)
Can you properly explain to me how to do sigma r=0 to r=n with some examples. I still dont get it....
It's the same as 1 to n but just an additional term involved?
19. Good Luck!
20. (Original post by iMacJack)
It's the same as 1 to n but just an additional term involved?
So what would it be for sigma r=0 r=n for r and sigma r=0 and r=n for rsquared

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