Mathematics: Post your doubts here!

[Suchal Riaz]

I am saved, ty

btw this is igcse thread not A level thread thoughtblocker

 

[Thought blocker]

btw this is igcse thread not A level thread thoughtblocker

I forgot :'(

 

[Suchal Riaz]

I forgot :'(

bachay hamare questions dekh dekh kar pareshan ho rhe hon ge

 

[Thought blocker]

bachay hamare questions dekh dekh kar pareshan ho rhe hon ge

ha darling esa hi hua hoga

 

[Mai(M4!)]

I too need help in Transformation ( stretch, shear , single matrix transformation etc )
Dont know anything about these topics ///

1) the invariant line : if any point is on this line it doesn't move
2)the scale factor = the distance between image and invariant line / the distance between object and invariant line
here is a video that might help

 

[Mai(M4!)]

when do you guys have paper 4 maths??? me monday!!

me too

 

[Mai(M4!)]

I too need help in Transformation ( stretch, shear , single matrix transformation etc )
Dont know anything about these topics ///

if u read the syllabus u will find that single matrix transformation isn't included

 

[Mai(M4!)]

What is it?
I will solve it latter i have my bio exam tomorrow so i am getting ready for it

what bio exam did u have

 

[Mai(M4!)]

Hi guys, can anybody please tell me how to find an angle using the cosine rule? I know the formula is a squared= b squared + c squared - 2bc cos A but it can only be used to find the side, not the angle??????

rearrange them to be
angle A=cos-1(b square+c square-a square/2bc)

 

[Mai(M4!)]

can someone explain how to find a matrix representing a transformation, pleaaaaaassee
I dont want to memorize them, cause they're they wanna know how did u get it.. so please anyone?

here is a simple way to do it but you need to be quick
if u have this one for example Q14
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s12_qp_22.pdf
put points in matrix this way x
y
so object matrix 1 2 3
1 1 2
the image matrix 3 4 7
1 1 2
by eyes you will find that y didn't change so the lower row will be (0 1)
x has changed notice that x+2y=new x so the upper row will be (1 2)
so 2x2 matrix = 1 2
0 1
the 1 is multiplied by x and 2 by y both added together formed the new x
o by x and 1 by y then only y so new y=y

for other transformation they may stay the same so 1 0
0 1
or the x and y replace each other as (2,1) to (1,2)
so matrix = 0 1
1 0
if they only change sign then matrix = -1 0
0 -1
if they replace each other with other sign matrix = 0 -1
-1 0



hope this helps
i know it may seem complicated but you can try it and if u have any question u can always ask

 

[Mai(M4!)]

help PLEASE!\

Beatrrice pays yearly rent of 10,800,

tax of 6000 and

bills of x

after she has paid all 3 she is left with 12,000

calculate how much she spends on bills??

how much did she have at first?

 

[Mai(M4!)]

(ii)
View attachment 41668

X=MULTIPLY BY
x=sympol
cone volume=πr^2 X h
w=πx^2Xy
(i) new h=3y
new r=3x
new volume=scale factor^3=3^3=27
w=27
(ii)new h=h=y
new r=2h=2x
new volume=π(2x)^2y=π4x^2 X y compared to πx^2 X y it is only multiplied by 4
so new volume =4w

 

[dubi2pro]

how much did she have at first?

b part

 

[Mai(M4!)]

Can anyone help with question 9 ? http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s12_qp_42.pdf

this is loci
so i'll just tell u how to do it
(a)perpendicular bisector (stand on G by the compus and open it more than the half of the length GH
draw 2 arcs before the line GH and after
do the same when on H but don't change the length opened by the compus
there should be 2 intersections around the line GH join them together to draw the perpendicular bisector )

(b)angle bisector (draw 2 arcs on lines GH and GF when standing on G
Then with the same length stand on the intersection between the arc and the line and draw another arc between the 2 lines repeat it on the other line
draw a line to join the intersection of both arcs drawn in last step and point G)

(c)change 550 to cm
550/100=5.5
open the compus to 5.5 cm then stand on f and draw a circle

R should be nearer to G and line FG and out of the circle
after you answer it send a pic if u r not sure it is right

 

[Suhaib]

if u read the syllabus u will find that single matrix transformation isn't included

I'm taking GCE MATHS and i think so thats included in syl.

 

[Mai(M4!)]

b part

40 000 -(tax +rent+bills)=12 000
x=bills
40 000-6000-10 800-x=12 000
23 200-x=12 000
-x=12 000-23 200=-11200
x=-11200/-1=11200
bills=$11 200

 

[Suhaib]

40 000 -(tax +rent+bills)=12 000
x=bills
40 000-6000-10 800-x=12 000
23 200-x=12 000
-x=12 000-23 200=-11200
x=-11200/-1=11200
bills=$11 200

How did u get 40 000 ???

 

[dubi2pro]

40 000 -(tax +rent+bills)=12 000
x=bills
40 000-6000-10 800-x=12 000
23 200-x=12 000
-x=12 000-23 200=-11200
x=-11200/-1=11200
bills=$11 200

Ahh Yeah! i forgot the total amount!

Listen same paper, Q5, (e)

to help u save time here is the info of previous parts

angle BAC = 39,.8
angle ABC =115
distance AB= 40 KM
DISTANCE BC = 60 KM

i guess they are askin to find AC?

 

[dubi2pro]

How did u get 40 000 ???

Its the total amountt

 

[Mai(M4!)]

I'm taking GCE MATHS and i think so thats included in syl.

aha ok
sorry i know nothing about it and i can't find it on internet
try reaching ur teacher on internet or call him if u can't meet him due to exams