Maths, Addmaths and Statistics: Post your doubts here!

[Helyat]

Can someone solve this pls?
log5y= 4logy5

y=25 AND y = 1/25 since the +/- sign should be considered

 

[sweetiepie]

http://www.xtremepapers.com/community/threads/o-level-notes-center.11138/ for notes check here hope this helps

 

[kadellsayyed]

can on please put notes on transformations o level or provide me with a link to download please?????????

 

[kadellsayyed]

can on please put notes on transformations o level or provide me with a link to download please?????????

 

[Al. Ahmad]

in which math book is the chapter of symmetry included? i'm talking about D1, D2, D3 or D4?

 

[Enferno]

I tried to solve this question, I did the Part (i) and obtained the correct answer, but I cannot get the answer to Part (ii), my question is that
How is X equal to (A + I)-1 or whatever is in the question, please can anyone explain it . What is happening in this part? I am not getting it.






Question:


Answer:

 

[Dashing Cancerian]

in which math book is the chapter of symmetry included? i'm talking about D1, D2, D3 or D4?

its in the addendum of book 1

 

[Enferno]

A function f is defined by f (x)= 2x2– 20x + 37 for x>k. Given that the function f–1(x) exists,
(iii) write down the least possible value of k [1]
Please solve.....

 

[brainswipe]

I tried to solve this question, I did the Part (i) and obtained the correct answer, but I cannot get the answer to Part (ii), my question is that
How is X equal to (A + I)-1 or whatever is in the question, please can anyone explain it . What is happening in this part? I am not getting it.






Question:
View attachment 18935

Answer:

View attachment 18936

can you tell me the paper and its year and its question number!!

 

[HamzaNaqi]

C

Re: O'level Maths, Addmaths and Statistics help available he

Agreed with hamidali391!

Can we use xtra sheet in statistics exam and if e have used than what would happen

 

[altox876]

Can someone explain how to solve Q 28 b)ii
http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w11_qp_12.pdf

 

[altox876]

C
Can we use xtra sheet in statistics exam and if e have used than what would happen

Extra sheet is not allowed

 

[Hum199]

I tried to solve this question, I did the Part (i) and obtained the correct answer, but I cannot get the answer to Part (ii), my question is that
How is X equal to (A + I)-1 or whatever is in the question, please can anyone explain it . What is happening in this part? I am not getting it.






Question:
View attachment 18935

Answer:

View attachment 18936

Very tough question!
I think i need to ask it from the teacher!
Thx for sharing though!

 

[ritesh isuri]

I tried to solve this question, I did the Part (i) and obtained the correct answer, but I cannot get the answer to Part (ii), my question is that
How is X equal to (A + I)-1 or whatever is in the question, please can anyone explain it . What is happening in this part? I am not getting it.






Question:
View attachment 18935

Answer:

View attachment 18936

from the equation AX+X=B, we remove the x outside to get: X(A+I)=B

plz note that in matrix when there is nothing in front of a matrix we assume it has the identity matrixx in front coz if we multiply the identity matrix by the matrix we get the same matrix.(its just like if we have a variable X the number before it is 1 ), the I in the brackets above represents the identity matrix. by the equation i have formed if we make x the SOF, we get X=B/(A+I), but in matrix division doesn't exist, so if we have to make x the SOF, we multiply B by (A+I)-1, and we get the answeras x=(4 and below 2) plz let me know whether or not u have understood

 

[Enferno]

from the equation AX+X=B, we remove the x outside to get: X(A+I)=B

plz note that in matrix when there is nothing in front of a matrix we assume it has the identity matrixx in front coz if we multiply the identity matrix by the matrix we get the same matrix.(its just like if we have a variable X the number before it is 1 ), the I in the brackets above represents the identity matrix. by the equation i have formed if we make x the SOF, we get X=B/(A+I), but in matrix division doesn't exist, so if we have to make x the SOF, we multiply B by (A+I)-1, and we get the answeras x=(4 and below 2) plz let me know whether or not u have understood

Thank alot, Yeah I hve understood

 

[Hum199]

from the equation AX+X=B, we remove the x outside to get: X(A+I)=B

plz note that in matrix when there is nothing in front of a matrix we assume it has the identity matrixx in front coz if we multiply the identity matrix by the matrix we get the same matrix.(its just like if we have a variable X the number before it is 1 ), the I in the brackets above represents the identity matrix. by the equation i have formed if we make x the SOF, we get X=B/(A+I), but in matrix division doesn't exist, so if we have to make x the SOF, we multiply B by (A+I)-1, and we get the answeras x=(4 and below 2) plz let me know whether or not u have understood

I got u but i have one question:
If we multiply B By (A+I)-1 , how can we say that X is equal to (A+1)-1?

 

[ritesh isuri]

I got u but i have one question:
If we multiply B By (A+I)-1 , how can we say that X is equal to (A+1)-1?

even i did not understood that part!! maybe thats another method of doing it!!

 

[Hum199]

even i did not understood that part!! maybe thats another method of doing it!!

Dude, i did it till that step but after that i m confused abt how is it equal to X :S
Due to which i called it a tough question.

 

[zt2012]

i have this question g(x)=x2-xand they have asked for its inverse of g(6)

 

[Hum199]

i have this question g(x)=x2-xand they have asked for its inverse of g(6)

I did not get ur inverse thingy...
Can u further explain the question?