Mathematics: Post your doubts here!

[Debonny1]

If you equate the equation of the curve to zero you get the solution of the curve
and if you equate the derivate of the equation to zero, you get the stationary point.
If you have a point on the curve, you can use the coordinates of that point and the gradient of the curve at that point to find the equation of the tangent to the curve at that point.

Yea I know.. But will the equation of the tangent also be equal to 0? I saw some qs in which they did that

 

[Charlotte20102013]

HI. Can someone help me with this please?
QP: http://onlineexamhelp.com/wp-content/uploads/2013/11/9709_w12_qp_31.pdf
9709/31/ON/12 Q7 (ii). When I equate the denominator to 0, shouldn't I get both x=0 and 3y^3-1=0 ? Why does the mark scheme solve for only 3y^3-1=0?
MS: http://onlineexamhelp.com/wp-content/uploads/2013/11/9709_w12_ms_31.pdf
Thank you!

 

[tiki-taka]

HI. Can someone help me with this please?
QP: http://onlineexamhelp.com/wp-content/uploads/2013/11/9709_w12_qp_31.pdf
9709/31/ON/12 Q7 (ii). When I equate the denominator to 0, shouldn't I get both x=0 and 3y^3-1=0 ? Why does the mark scheme solve for only 3y^3-1=0?
MS: http://onlineexamhelp.com/wp-content/uploads/2013/11/9709_w12_ms_31.pdf
Thank you!

you have to put the y value into the main equation ln(xy) − y ^3 = 1. to find x

 

[TheJDOG]

Anymore doubts guys? Good luck everyone in all your exams

 

[sara kamal]

http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_qp_32.pdf
please explain Q10 part 3

 

[sara kamal]

http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_qp_61.pdf
plzzz explain q6 part4

 

[kitkat <3 :P]

http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_qp_32.pdf
please explain Q10 part 3

Ignore my handwriting please

 

[TheJDOG]

Here are some important questions from O/N 2013 p32 which I felt need to be posted here
Also, I have this doubt, Q8)b) how do we find the Least |z-w| for the loci? It carries two marks :/ , I tried to do it but it's not working :/
Help would be very appreciated for my doubt

 

[TheJDOG]

Continued..

 

[ahmedish]

Can someone help in estimating the mean from cumulative frequencies and such?
in Winter 2013 v62 Q4, we took the classes as 100<x<150 and then 150<x<175 and therefore got midpoints of 125 and 162.5 while in Summer 2011 v63 we took the class as 0-9 and 10-19 and therefore got midpoints of 4.5 and 14.5
When do I do the first one and when do I do the second one? I keep getting confused.

 

[najiya]

Here are some important questions from O/N 2013 p32 which I felt need to be posted here
Also, I have this doubt, Q8)b) how do we find the Least |z-w| for the loci? It carries two marks :/ , I tried to do it but it's not working :/
Help would be very appreciated for my doubt

could u please do 7(ii)
could be really helpfull

 

[TheJDOG]

could u please do 7(ii)
could be really helpfull

ok ill do it for you tomorrow

 

[asadalam]

when is your p3 guys?Anyone here giving stats?

 

[Charlotte20102013]

you have to put the y value into the main equation ln(xy) − y ^3 = 1. to find x

Yes I know eventually how to find it. My question is when you equate eg. x(x-5)=o, you get x=0 and x-5=0. Why isn't it the same for this case then?

 

[Wolfgangs]

Can someone help me with these questions?

 

[DaniyalK]

Here are some important questions from O/N 2013 p32 which I felt need to be posted here
Also, I have this doubt, Q8)b) how do we find the Least |z-w| for the loci? It carries two marks :/ , I tried to do it but it's not working :/
Help would be very appreciated for my doubt

https://malaysia.answers.yahoo.com/question/index?qid=20140919190443AAmSFNU

 

[kitkat <3 :P]

Can someone help me with these questions?

Can you tell from which year it is? Or the final answers?

 

[Wolfgangs]

Can you tell from which year it is? Or the final answers?

Paper 31 May/June 2013

 

[DaniyalK]

http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_qp_61.pdf
plzzz explain q6 part4

When there are repeating letters in combinations, you split them into cases based on how many times the repeating letter occurs.
0A: 3C3 (choosing 3 from T,I,Z)
1As : 3 (from previous part)
2As : 3C1 (choosing 1 from T,I,Z)
3As: 1
Total = 8

 

[omaaaar]

http://maxpapers.com/wp-content/uploads/2012/11/9709_w14_qp_32.pdf
Q5 part 2 can u pls solve and explain