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Edexcel FP1 Thread - 20th May, 2016

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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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Reply 941

hogree

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?

Reply 942

iMacJack

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!

Reply 943

TrueDAN

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 :smile:

Best luck in the exam!

Reply 944

TheMoon

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 :/

Reply 945

crashMATHS

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

Good luck everyone.

GL everyone!

Original post by TheMoon

yeah sorry, I used p=3 for some reason when getting the x coordinate. not sure then :frown:

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

Reply 949

Hot&SpicyChicken

Are the IAL papers necessary?

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

Is this bad?

Reply 950

economicss

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 :smile:

have you done part b? Thanks :smile:

Reply 951

crashMATHS

Original post by Hot&SpicyChicken

Are the IAL papers necessary?

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

Is this bad?

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

Reply 952

alfmeister

Here you go mate.

(edited 7 years ago)

Reply 953

TrueDAN

Good luck all :biggrin:

Reply 954

fpmaniac

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....

Reply 955

iMacJack

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?

Good Luck!

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

Reply 958

Hot&SpicyChicken

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