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The Edexcel C4 (21/06/12 - PM) Revision Thread

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Reply 1920

Jack_Smith

Original post by Lalaa

anyone have any clue about similar triangless ?? =\

jan 09?? didnt get that either?? Didnt we do this in gcse :/

Reply 1921

Ai-

does anyone know how to do June 2005 q7 part d? :|

Reply 1922

bunnyhana

Original post by Jack_Smith

i think you dot product the equation of line l with the scalar quantity of line l which equals to 0. You then find lamda which you would sub back into the equation of l to get the position vector of c!

I think my wording is very crappy, if you dont get it let me know i would try and show the working out!

no sorry is still dont quite get it.. :frown:

Reply 1923

Jack_Smith

Original post by Ai-

does anyone know how to do June 2005 q7 part d? :|

its a parallelogram so AD = BC
you know BC
AD = D -A
so you do BC + A TO GET D

i think the ms shows a diff method but i understand this! i asked my teacher he said this method was right aswel!

Reply 1924

Abdullah CEO

Original post by blahhblah

could anyone possibly explain to me how to do Q3 in June 2010?! Im really stuck and the mrk scheme makes no sense :frown:

have you worked it out yet?
use the fact that 2^x when you differentiate you will get 2^xln(2). then y^2 wil become 2y dy/dx. finally solve 2xy using the product rule i will do it on a piece of paper take a picture and try to upload it for you.

Reply 1925

exe

Original post by abu125

how would you intergrate, 2/(1+x)^2 dx?

intg[2(1+x)^-2] =
-2(1+x)^-1

Reply 1926

exe

gonna stop doing questions soon and get into zen mode.

good luck tomorrow guys i know i need it :colondollar:

Reply 1927

bunnyhana

OHHHHH yes i get youuu!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! OMG thank you soo muck!!!!

LOL i meant much

Original post by bunnyhana

no sorry is still dont quite get it.. :frown:

Dont worry there was a point where i didnt understand it aswell! Ive attatched an image, see if you understand it like that!

c4.jpg39.3KB

Reply 1930

Ai-

Original post by Jack_Smith

its a parallelogram so AD = BC
you know BC
AD = D -A
so you do BC + A TO GET D

i think the ms shows a diff method but i understand this! i asked my teacher he said this method was right aswel!

thank you so much! :biggrin:

Reply 1931

jameshewitt

Good luck to everyone taking the exam tomorrow, I hope you'll all achieve the grades you're aiming for! :biggrin:

Reply 1932

Abdullah CEO

thats the best that i could do for you

Reply 1933

Jack_Smith

Original post by bunnyhana

LOL i meant much

Oh so you wouldnt be needing my arty drawing then :frown:

Hahaha dont worry! im suprisedd you got it from the way i worded it :/

Reply 1934

otrivine

Original post by Abdullah CEO

thats the best that i could do for you

ok i used the integration by parts , and this was my final answer for integration

(1/2+7/2cos2x) (x) + (7/2) (1/2-1/2cos2x)+c

for the june 2010 but keep getting different answer http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/june2010-qp/6666_01_que_20100618.pdf
6)c)

Reply 1935

Lalaa

Original post by Jack_Smith

jan 09?? didnt get that either?? Didnt we do this in gcse :/

LOL... i thinkk sooo.. HOW ARE WE SUPPOSED TO REMEMBER STUFF FROM GCSE =O.. crazyyy edexcelllll !!!!

Reply 1936

grazie

Original post by otrivine

ok i used the integration by parts , and this was my final answer for integration

(1/2+7/2cos2x) (x) + (7/2) (1/2-1/2cos2x)+c

Integration by parts is fine, but that doesn't look quite right. I get...

I=\left[\dfrac{7}{4} \theta \sin2\theta+\dfrac{7}{8} \cos2\theta+\dfrac{\theta^2}{4} \right]_0^{\frac{\pi}{2}}

Reply 1937

annony

hi are there any equations that we need to know like area/volume of a cone sphere etc????
thanks!

Reply 1938

.Missy

Can someone help me with June 2006 question 7 part C

http://www.examsolutions.co.uk/a-level-maths-papers/Edexcel/Core-Maths/Core-Maths-C4/2006-June/paper.php

Reply 1939

Huda134

Can someone give me an example of when we have to adjust the integral of the form lnlax+bl?
And do we have to adjust for all types of integrals or just the ln ones?

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