IGCSE MATHS Doubts

[contraentry]

I have found Paper 4 to be a bit more rigorous than Paper 2, however, questions that go into deep detail are usually asked in Paper 4, where as the "quick" questions are put forward in Paper 2...

[PeaceMaker]

There are no irrelevant chapters in maths. expect questions from every chapter in both the papers.

Well, i didn't mean literally irrelevant (No point in making us study if they are not going to bring it, right?) What i meant was if the chapter was irrelevant in terms of paper 2. From what im seeing, paper 2 mostly has algebra, percentage, ratio, order/line of symmattry, matrices, the nth rule and sometimes graphs.

[saleemsamer]

srry i didnt post the paper but yes its paper 4
and im sorry but i still didnt get the shear can u plz show me on a diagram the points
and for question 4a any1?
sry if im askin 4 2 much
and thx 4 ur hlp

[The Golden Girl =D]

Well, i didn't mean literally irrelevant (No point in making us study if they are not going to bring it, right?) What i meant was if the chapter was irrelevant in terms of paper 2. From what im seeing, paper 2 mostly has algebra, percentage, ratio, order/line of symmattry, matrices, the nth rule and sometimes graphs.

of what i noticed from solvin alot of past papers of math both 2 and 4...is that what comes in paper 2 is random ....once they put the sequence chapter and in other times they don't .... etc..

as for paper 4 it has some chapters which my tutor said that they defenitly come among many random others!! ..ex: mensuration ..graph function "equations and drawing the graph" .....linear programing "is random" ...umm sequence .... percentage , ratio and tax ...etc..........

got it ?

hope i helped

[PeaceMaker]

of what i noticed from solvin alot of past papers of math both 2 and 4...is that what comes in paper 2 is random ....once they put the sequence chapter and in other times they don't .... etc..

as for paper 4 it has some chapters which my tutor said that they defenitly come among many random others!! ..ex: mensuration ..graph function "equations and drawing the graph" .....linear programing "is random" ...umm sequence .... percentage , ratio and tax ...etc..........

got it ?

hope i helped

Yeah. Thank you for your time and i guess i'll study everything from start to finish just to be on the safe side.

[saleemsamer]

hi guys can some1 post the diagram for oct/nov 09 p4 question 4a
and can sum1 plz explain questions 2a)iv and b)ii (same paper)
thx in advance

[Dark Prince]

i have sme question as above....plzz answer

[Vin]

hi guys can some1 post the diagram for oct/nov 09 p4 question 4a
and can sum1 plz explain questions 2a)iv and b)ii (same paper)
thx in advance

i'll try gimme some time..

[Vin]

i'll try gimme some time..

[Vin]

hi guys can some1 post the diagram for oct/nov 09 p4 question 4a
and can sum1 plz explain questions 2a)iv and b)ii (same paper)
thx in advance

a iv)  shear,  factor = -1 , y-axis invariant line

u should know the formula

shear =  distance moved due to shear
            ----------------------------
             perpendicular dist. frm invariant

[Vin]

hi guys can some1 post the diagram for oct/nov 09 p4 question 4a
and can sum1 plz explain questions 2a)iv and b)ii (same paper)
thx in advance

n also b) ii)

theres a great method my teacher taught me...
  (y)      x      U         =       X         
(a  b)     (-1  -4  -4 )        (  -1   -4  -4)
(c  d)     (1     1    3 )  =   (   2     5   7 )

multiply a b c d in matrix y to matrix U (they are the positions of the image, row 1 is x axis  row 2 is y )

( (-a + b) (-4a+b)  (-4a + 7b)  )
( (-c+d )   (-4c +d)  (-4c+ 7d)  )

now solve any two equation my simultaneous method...

so,  -a +b   = -1 (because the position of this equation is corresponding to matrix "X", look for the colours)

      -4a + b = -4

by solving u get a = 1 , b = 0
same for 'c' and 'd' ..u get  d= 1 and c = -1

i dont expect u to understand but this method is really good n its really difficult for me to teach online..
read it n try to follow the steps while solving the paper u might get it...

     

[Dark Prince]

a iv)  shear,  factor = 1 , y-axis invariant line

u should know the formula

shear =  distance moved due to shear
            ----------------------------
             perpendicular dist. frm invariant

Actually i did this Q da sme waybut in da mark scheme da answer is Scale factor= -1......how is da scle factor -ve

[Snake]

- scale factor can either mean inverted picture or smaller then original picture

[Vin]

Actually i did this Q da sme waybut in da mark scheme da answer is Scale factor= -1......how is da scle factor -ve

oh my bad... the image moves to the left is -ve and to the right is positive..

sorry about that mistake..i'll amend it

[Dark Prince]

can u explain it .....y is da scale factoe -ve wen we move da image to left.....nd is this rule same 4 all quadrants? wat abt 3rd quadrant......wat if da image is on x-axis.....nd wat abt stretch( wen is its scale factor -ve).....thnkx.