Edexcel 2016 Core 4 - Model Solutions (1-6, Will complete after gym)

http://www.thestudentroom.co.uk/showthread.php?t=4185241&p=66085535#post66085535

(edited 7 years ago)

core420161.pdf176.6KB

Shouldn't t= pie/4 for both X and y? Thanks for the solution btw. Can't wait to see solution for Q7 and 8.
I think I have made some mistakes in the last 2 questions.

Reply 2

MathsAndChess

Original post by angela06

Shouldn't t= pie/4 for both X and y? Thanks for the solution btw. Can't wait to see solution for Q7 and 8.
I think I have made some mistakes in the last 2 questions.

No, The original function was

y=5\sqrt3 \sin 2x

Reply 3

iBall

Original post by MathsAndChess

I have produced some model solutions for the C4 today.
If there are typos, let me know, their are always typos.
I will complete the last two questions at gym, Latexing these solutions took too long, but it was fun.
Enjoy!

#

How many marks was question 5?

Reply 4

jamessmith15

Original post by MathsAndChess

can u explain how i got c to be equal to -720

Reply 5

MathsAndChess

Original post by iBall

#

How many marks was question 5?

I left the actual paper in my locker. I think it was 9

Reply 6

MathsAndChess

Original post by jamessmith15

can u explain how i got c to be equal to -720

Which question?

Reply 7

iBall

Original post by MathsAndChess

I left the actual paper in my locker. I think it was 9

for the parametric say I integated tant by accident but continued to wok everythimg throughout how many marks would I have lost>

Reply 8

MathsAndChess

Original post by iBall

for the parametric say I integated tant by accident but continued to wok everythimg throughout how many marks would I have lost>

I'd say 4, if you used your

\frac{dx}{dt}

correctly.

Reply 9

iBall

Original post by MathsAndChess

I'd say 4, if you used your

\frac{dx}{dt}

correctly.

I hope so man, I got every other mark. Are you familiar with this type of error?

Also how many marks was each part? My methods were fine it was literally one step

(edited 7 years ago)

Reply 10

MathsAndChess

Original post by iBall

I hope so man, I got every other mark. Are you familiar with this type of error?

Also how many marks was each part? My methods were fine it was literally one step

I think it was 5 and 4.

Reply 11

jamessmith15

Original post by jamessmith15

can u explain how i got c to be equal to -720

question 4 mate

Reply 12

MathsAndChess

Original post by jamessmith15

question 4 mate

There isn't a -720, Do you mean

-\frac25 \ln 60

Reply 13

jamessmith15

Original post by MathsAndChess

There isn't a -720, Do you mean

-\frac25 \ln 60

yes I'm asking if you know how i got -720 instead of that
and how many marks i will have lost

Reply 14

jamessmith15

Original post by jamessmith15

yes I'm asking if you know how i got -720 instead of that
and how many marks i will have lost

i think if i remember correctly i ended up with an equation of
-1/5x^2=t-720

Reply 15

MathsAndChess

Original post by jamessmith15

i think if i remember correctly i ended up with an equation of
-1/5x^2=t-720

Look at my solution.

Reply 16

jamessmith15

Original post by MathsAndChess

Look at my solution.

i think its because i had the x ontop of the fraction instead of the bottom.
How many marks do u think i will loose?
i ended up with a final answer of:
x= root (-5t +3600)

(edited 7 years ago)

Reply 17

nxp790

do you have the answers for 7 and 8 please