Mathematics: Post your doubts here!

[xoxoxogaurav123]

ya its log x/base

 

[sparsha.mehta]

to find the inverse of that function you have to use one of the laws of logs

Yup but its fine if you don't mention in the function...fr substition u hv to use log...

 

[xoxoxogaurav123]

log x/ base

 

[sparsha.mehta]

log x/ base

This is corrrect

 

[Igcse stuff]

i agree with both of you. btw are logs supposed to be in igcse exams? or are the examiners are just bending the rules a bit

 

[sparsha.mehta]

Log isnt mentioned in syllabus....

 

[Igcse stuff]

Log isnt mentioned in syllabus....

if thats the case, then i wonder why we are asked to answer questions that involve logs in functions

 

[Loren M]

1 cm on y axis is 5 squares

Ohh you used a ruler to find that?
Another question, why did you take 18?

 

[sparsha.mehta]

Ohh you used a ruler to find that?
Another question, why did you take 18?

Bcozzzzzz thts the frequency i mean the actual number of students.
No i did not use a ruler...see a normal graph ppr tht u buy frm a shop.it has a big square in which there r 4 small squares...i considered these small squares...hope u can understand...

 

[Bouchra]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s09_qp_4.pdf

Q4(b)(ii) Can someone please explain how to get the bearing? I tried many ways and still can't get it.

Same paper, Q11(d)(i) & Q11(d)(ii). For (i) please could you explain step by step how to do the algebraic manipulation, and for (ii) I would like to know a shortcut to find two consecutive terms of a sequence from the their sum?

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w10_qp_41.pdf

Q3(a) Can someone please explain step by step how to prove this?

Same paper, Q7(a) Can someone explain the reasons for x & y? Especially y, I don't understand how y is = 62, and why the MS says that it's because they're angles in the same segment/arc. How do you determine a segment or arc?

Also, Q7(c) Can someone explain this step by step?

Lastly, Q(9)(d) Can you explain step by step how to do the algebraic manipulation?

Thanks a lot in advance to whoever answers any of these questions. I hope they can be answered soon because the paper is on Monday.


Reposting because nobody seems to have answered any even though questions after it have been answered.

 

[Loren M]

Bcozzzzzz thts the frequency i mean the actual number of students.
No i did not use a ruler...see a normal graph ppr tht u buy frm a shop.it has a big square in which there r 4 small squares...i considered these small squares...hope u can understand...

Thank youu!

 

[Loren M]

1 cm on y axis is 5 squares

Thank you!

 

[Loren M]

How do we solve question 10g in paper 4 november 2009?

 

[Mariam Mohamed SX132]

Can someone pleaseeeee explain how to do question 7 of nov 2004, its on page 6 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w04_qp_4.pdf

 

[xoxoxogaurav123]

Ohh you used a ruler to find that?
Another question, why did you take 18?

see for frequency 18 the frequency density is 36

 

[xoxoxogaurav123]

Can someone pleaseeeee explain how to do question 7 of nov 2004, its on page 6 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w04_qp_4.pdf

see for the first question substitute x=4,p = 1, q = −2, r = −3 in equation y = px2 + qx + r
for second question substitute p,q, and r as shown above with y=0
For K take the formulae as y = p(-x)2 + q(-x) + r
For L take the normal formulae (y = px + qx + r) substituting y=0

 

[Mariam Mohamed SX132]

see for the first question substitute x=4,p = 1, q = −2, r = −3 in equation y = px2 + qx + r
for second question substitute p,q, and r as shown above with y=0
For K take the formulae as y = p(-x)2 + q(-x) + r
For L take the normal formulae (y = px + qx + r) substituting y=0

Thank youuu ! Can u also explain c(ii)

 

[Saahil Parikh]

ok one last doubt..
matrix operator for stretch with x-axis invariant is..
k 0
0 1?
please reply asap

 

[Loren M]

ok one last doubt..
matrix operator for stretch with x-axis invariant is..
k 0
0 1?
please reply asap

That's correct

 

[Loren M]

How do we solve question 1c (ii) ?
Please reply ASAP
Thanks in advance