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C4 Edexcel Full Worked Solutions 2016

I couldn't update the old forum.

Trapezium rule answer should be 1.083

I forgot the +c on 7a) like an absolute noob.
(edited 7 years ago)
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Reply 1
Avatar for a jones
a jones
6
How many marks was each question
For question 6b, when integrating -cos2theta, should it not equal -1/2sin(2theta), instead of -1/2sin(theta)
Original post by sharjeel743
For question 6b, when integrating -cos2theta, should it not equal -1/2sin(2theta), instead of -1/2sin(theta)
I agree that it should be, although it doesn't actually change the answer.
Trapezium rule 0 is y1 so 2(y2+y3...)

If you look at how far your estimate is from the real answer you'll see you did the trapezium rule wrong. Apart from that great work, really appreciate people like you.
(edited 7 years ago)
Reply 5
Avatar for Tan455
Tan455
1
Hey for the differential equation question I showed one method for part a and b and then 5 mins before the exam finished I went back and worked it out correctly under the other working out but forgot to cross out the incorrect method.Will I still get the marks?
Original post by sharjeel743
For question 6b, when integrating -cos2theta, should it not equal -1/2sin(2theta), instead of -1/2sin(theta)
Just a typo, woops
Hi everyone, just wanted to ask if i can have this split C1234 D1 S2 FP12 S3 S1 M1 M2
Original post by mehtj006
Trapezium rule 0 is y1 so 2(y2+y3...)

If you look at how far your estimate is from the real answer you'll see you did the trapezium rule wrong. Apart from that great work, really appreciate people like you.

The Trapezium rule is done correctly.
Original post by MathsAndChess
The Trapezium rule is done correctly.
trust me man it's not 1.803
Original post by mehtj006
trust me man it's not 1.803
Show me your solution, because it is.
Original post by MathsAndChess
Show me your solution, because it is.


The real area comes to 1.07, how the hell can the trapezium rule bring 1.803.

W/2(y1+2(y2+y3....)+y4)
Original post by mehtj006
The real area comes to 1.07, how the hell can the trapezium rule bring 1.803.

W/2(y1+2(y2+y3....)+y4)


Trapezium rule is very innacurate over this few strips.
Original post by Tan455
Hey for the differential equation question I showed one method for part a and b and then 5 mins before the exam finished I went back and worked it out correctly under the other working out but forgot to cross out the incorrect method.Will I still get the marks?

Depends on the marker, Probably not though
Reply 14
Avatar for Tan455
Tan455
1
Original post by MathsAndChess
Depends on the marker, Probably not though


So I won't get the marks?
Why dont you type them all in LaTeX?

That's would be much easier...
Original post by casperyc
Why dont you type them all in LaTeX?

That's would be much easier...


Probably. I only know the math functions though.
Original post by mehtj006
Trapezium rule 0 is y1 so 2(y2+y3...)

If you look at how far your estimate is from the real answer you'll see you did the trapezium rule wrong. Apart from that great work, really appreciate people like you.


Trapezium rule is (0.5)(0.2)(y1+yn+2(y2+y3+yn-1))
so you might be wrong I am sorry
but he is wrong as well
(edited 7 years ago)
Original post by MathsAndChess
Show me your solution, because it is.

Man, why are you so confident about your answers, you got all the y values right, recalculate it and you will find it is not 1.803 but 1.083 (3 d.p.)
Original post by JasPuddy
Man, why are you so confident about your answers, you got all the y values right, recalculate it and you will find it is not 1.803 but 1.083 (3 d.p.)


Okay... My bad.

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