We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
I did the same way bro , but the answer in marking scheme is different !Separate the variables and this would lead to an equation of
1/y dy = 6x/x^2 +4 dx
Integrate it and then put the values x and y which would result in your getting 'c'. Then express the equation in terms of x for y
I have a doubt regarding a differentiation sum of the following form:
The equation : (X^3 + XY^2 + aY^2 - 3aX^2=0) is given. Where a is a positive constant. The maximum point on the curve is M. How do i find the x coordinate of M? in terms of "a"
here's a tiphttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_3.pdf
Please help me with qn no. 3
I used the squaring method to solve this and got the critical values as x=1 and x=5/3. I don't understand why only x=1 is accepted and not 5//3. Could anyone please explain that? In addition, I'll really appreciate if you could show how to solve the question using graphical method.
Thanks a lot
Thank you for your help mate..here's a tip
when you have a modulus |...| on one side do not use the squaring method. try this instead: take the term in the modulus as a positive and a negative and solve them separately and then see what answers you get. also..... take care that your answer (value of x) is an INEQUALITY and not an EQUALITY as you previously stated. then plot them on a no. line and your answer will be the overlapping region.
Practice this method because our sir told us that after a lot of experience he has come to realize that the questions with a modulus on one side alone sometimes give the wrong answers or rather confusing answers (as in your case) when solved with the 'squaring on both sides' method.
Please NOTE that it MAY work on some cases and is not ALWAYS confusing or wrong but its better to be safe and use the positive/negative method instead for modulus at one side of the inequality.
Use the squaring on both sides method when there are modulus on both sides of the inequality. That will ALWAYS work.
If you don't get it (the method that I described) then please get back to me and i'll see if I can further explain.
(Y)
Thank you for your help mate..
I kinda get what you said, here's what I did:
|x-2| < 3-2x
-(x-2) < 3-2x or (x-2) < 3-2x
-x+2 < 3-2x or x-2 < 3-2x
x < 1 or x < 5/3
The marking scheme gave the answer as x<1 only. I don't know what to do next.. please show me how to continue from here.
Thanks a lot
Thanks a lot..
yeah you do. the < or > just tell you what region you mark on your number line. its not your answer.your answer is whatever region is overlapping. sometimes there may be an ambiguity there too because it's A-friggin-level ryt?! so the best way is to check all three regions using a value for x from each region and see which regions satisfy your ORIGINAL inequality.Thanks a lot..
Just one more doubt: you ALWAYS have to use the overlapping region? Even if it is the > sign?
Got it!yeah you do. the < or > just tell you what region you mark on your number line. its not your answer.your answer is whatever region is overlapping. sometimes there may be an ambiguity there too because it's A-friggin-level ryt?! so the best way is to check all three regions using a value for x from each region and see which regions satisfy your ORIGINAL inequality.
no probGot it!
Thanks man.. jazakallah
normally i would've been able to help but this is quite a ... 'difficult' questionCan someone help with Trignometry ?
Can someone help with Trignometry ?
@A star do you get it??normally i would've been able to help but this is quite a ... 'difficult' question
maybe if u post the answer? i mean the marking scheme??
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now