Maths, Addmaths and Statistics: Post your doubts here!

[osama]

hope it helps

 

[Aneesraja23]

well transformation matrix is easy...
first we'll look at the identity matrix....it is 10
01
we'll make this matrix 2 coordinates...one on the x axis and other on y axis..... like (1,0) and (0,1)
reflection on the x axis= 1 0 reflection on y axis = -1 0 reflection y=x = 0 1 reflection y=-x = 0 -1
0 -1 0 1 1 0 -1 0

this will be done for rotation as well

for stretch learn by that stretch makes you "look kool"

"look" is matrix for x axis and "kool" is for y axis...... here "L" is 1 and "K" is the stretch factor...... I'm not so sure about shear... hope it helps

thanks, but i really didn't understand :[ if i could have some sort of visual material to look at it'd be really helpful.

 

[Mayedah]

4024/21/O/N/2010
Question 11 (b)(ii)(b)
http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w10_qp_21.pdf

 

[Abdul345]

Relative velocity is that chapter which you can't study by yourself. Besides, if you don't get the concept from that Add math book, then other notes would be useless, most likely.
MY advice: leave relative velocity, practise other chapters instead.

hahahahahaha....and what if it comes...I am quite good at the rest...well thanks for the help...I think I'll have to ask my teacher

 

[bravegirl123]

I have problem in the last chapter that is relative velocity... its so damn confusing!!! especially interception questions!

 

[osama]

4024/21/O/N/2010
Question 11 (b)(ii)(b)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_21.pdf

are you even serious ?? this is an quadratic equation...u don't know how to solve it ??

 

[Spidey21]

are you even serious ?? this is an quadratic equation...u don't know how to solve it ??

we are add maths they are not..explain or dont ... dont insult anyone or pick up a fight...-__-

 

[Spidey21]

hahahahahaha....and what if it comes...I am quite good at the rest...well thanks for the help...I think I'll have to ask my teacher

I have problem in the last chapter that is relative velocity... its so damn confusing!!! especially interception questions!

well the best this thread can do is help you at yuor questions...suggestion..go solve pps..and if any prob is there..share it here..

 

[Spidey21]

in RV...u must master vectors first.... then remember this basic formula​

Va = Va/b + Vb​

by this make the unknown side the subject and add the vectors by tip to tail method....once ur diagram is drawn rest is easy....​

important quatations​

velocity of plane in still air = velocity of plane relative to wind​

velocity of boat in still water = velocity of boat relative to river​

course set by pilot/boat = bearing of relative velocity​

good tips...worth it...

 

[osama]

we are add maths they are not..explain or dont ... dont insult anyone or pick up a fight...-__-

ok then..

 

[osama]

for solving quadratic equations

aX^2 + bX + c = 0

use the quadratic formula:
b +/- (b^2 - 4ac)^1/2
2a

 

[osama]

good tips...worth it...

 

[Spidey21]

now we are headed off topic...just a random question..what if my calculator is not allowed and i give the paper without the invigilator taking it...am i doing it right??

 

[Mayedah]

for solving quadratic equations

aX^2 + bX + c = 0

use the quadratic formula:
b +/- (b^2 - 4ac)^1/2
2a

I know how to solve quadratic equations ! I have never had problem in this ..i even got the answer to x but cant make the equation and reduce it to x^2 +34x-225=0

 

[osama]

well....which calculator u got u gotta check it first.... calculator with graphic display and symbolic integrations are not allowed...ur the lucky one if the invigilator doesn't take it

 

[asd]

well....which calculator u got u gotta check it first.... calculator with graphic display and symbolic integrations are not allowed...ur the lucky one if the invigilator doesn't take it

And 'symbolic' and 'numerical' integration and differentiation are different...

 

[Spidey21]

4024/21/O/N/2010
Question 11 (b)(ii)(b)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_21.pdf

let me explain you how youll do it..

from the part a youll have an expression for y in terms of x.

then from part b youll make one expression and that should be something like 3y= (27+3x) x (25+x)

then you simultaneously solve both of them and then ill give you your water cooler...

 

[Mayedah]

I made the equation after the equal part the same but y the 3y ?

 

[osama]

I know how to solve quadratic equations ! I have never had problem in this ..i even got the answer to x but cant make the equation and reduce it to x^2 +34x-225=0

well
length will be:
(27+3x)m
width will be
(25+ x)m
so what question says is
area of large lawn = 2x area of small lawn
(27+3x)(25+x) = 2(27 x 25)
675 + 27x + 75x + 3x^2 = 1350
3x^2 + 102x - 675 = 0
now divide both sides by 3
(3x^2 + 102x + 675)/3 = 0/3
x^2 + 34x + 225 = 0

hope it helps

 

[GetSomeLife]

4024/21/O/N/2010
Question 11 (b)(ii)(b)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w10_qp_21.pdf

2(27*25) = (27+3x)(25+x)
1350 = 27(25+x) +3x(25+x)
1350 = 675 + 27x + 75x + 3x^2
1350 = 675 + 102x + 3x^2

Bring it all on one side:

3x^2 + 102x - 675 = 0

Divide by 3

x^2 + 34 - 225 = 0

Solve