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Edexcel FP2 Official 2016 Exam Thread - 8th June 2016

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Thanks so much! It says in the answers though that the answer for part c is 1, but not sure whether it's wrong or not?! :smile:

Sorry, yes. I rushed this so didn't double check! The answer is 1 because the lowest point wasn't the correct one, it was the point at which the locus is at a normal to the radii. I can draw a diagram up if you want?

Reply 981

Cpj16

can someone explain in words, how to solve question 8b on June 2013 (R) Paper thanks

Also is there a 2015R paper??- if there is can someone set me a link :biggrin:

link to paper June 2013 R :
https://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/June%202013%20(R)%20QP%20-%20FP2%20Edexcel.pdf

edit: I don't understand what or why we differentiate

(edited 7 years ago)

Reply 982

EricPiphany

Original post by Cpj16

can someone explain in words, how to solve question 8b on June 2013 (R) Paper thanks

Also is there a 2015R paper??- if there is can someone set me a link :biggrin:

Find the point on the curve such that the tangent is parallel to the initial line, then calculate it's y coordinate.
Can you see what to do next?

Reply 983

Tizzydag

Original post by Alby1234

Can anyone telling me what I'm doing wrong in part b? I'm separating the variables but it gives a nasty reciprocal on on of the integrals which proves difficult to solve. Am I going about it the right way? fp2 capture 5.JPG

do you have the answers?

Reply 984

economicss

Original post by ImJared

If you could please that would be really helpful, thanks :smile:

Reply 985

Cpj16

Original post by EricPiphany

Find the point on the curve such that the tangent is parallel to the initial line, then calculate it's y coordinate.
Can you see what to do next?

Thanks for your help.
I don't understand what the y co-ordinate there is
because the polar co-ordinate (r, theta)

Reply 986

Zacken

Original post by Cpj16

Also is there a 2015R paper??- if there is can someone set me a link :biggrin:

There isn't.

Reply 987

EricPiphany

Original post by Cpj16

Thanks for your help.
I don't understand what the y co-ordinate there is
because the polar co-ordinate (r, theta)

We have y = r sin(θ).

(edited 7 years ago)

Reply 988

ImJared

Original post by economicss

If you could please that would be really helpful, thanks :smile:

Just drew this up quickly - a bit scruffy but it demonstrates what I'm talking about. The lowest point is where the line from the origin to the circle is at a tangent (as the gradient no longer gets steeper). Therefore, you can use simple Pythagoras to determine the length from the origin to the point.

Reply 989

Cpj16

Original post by EricPiphany

We have y = r sin(θ).

Ahh thanks

Also when we have an modulus inequality question with which have the greater or equal to sign.
Then what do we do?!

Reply 990

EricPiphany

Original post by Cpj16

Ahh thanks

Also when we have an modulus inequality question with which have the greater or equal to sign.
Then what do we do?!

With complex numbers or reals?

Reply 991

Cpj16

Original post by EricPiphany

With complex numbers or reals?

real

x+2≥3/x

(edited 7 years ago)

Reply 992

Cpj16

I have added an example of what I mean

Reply 993

EricPiphany

Original post by Cpj16

real

Solve exactly as you do the ones with a strictly greater than sign. Then check both sides of any interval behaves as expected, and if not, remove it from the solution.
Sorry this is a really bad explanation, either someone else will help, or send an example that I can do.

Reply 994

Cpj16

Original post by EricPiphany

I posted one above

Reply 995

EricPiphany

Original post by Cpj16

I posted one above

( I'm assuming you've been taught how to do this in the past.)T here are other ways too, you could do case work.

Reply 996

Cpj16

Original post by EricPiphany

( I'm assuming you've been taught how to do this in the past.)T here are other ways too, you could do case work.

thanks this was a really good explanation

(edited 7 years ago)

Reply 997

Cpj16

Will it always follow the same pattern

Reply 998

economicss

Original post by ImJared

Thanks very much! I get that the 2 is the radius but how did you find root 5 please, bit confused about how you know where to draw the lines to find the angle, thanks :smile:

Reply 999

Zacken

Original post by economicss

Thanks very much! I get that the 2 is the radius but how did you find root 5 please, bit confused about how you know where to draw the lines to find the angle, thanks :smile:

Distance from centre to origin. Use the distance formula.