Oops, my bad. Trying to do too many things at once haha Was thinking of logs as this is where they usually come up where for example, ln0.7 is negative. Fixed it now, thanks for pointing it out.(Original post by marioman)
This isn't correct. You only change the sign when dividing by a negative number (an integer or otherwise).
You are Here:
Home
> Forums
>< Study Help
>< Maths, science and technology academic help
>< Maths
>< Maths Exams


 Follow
 21
 12052015 19:38
Last edited by c223; 12052015 at 19:41. 
 Follow
 22
 12052015 19:39
(Original post by kawehi)
Does anyone have any particularly difficult questions that they've come across? 
 Follow
 23
 12052015 19:40
Awkies thanks you're both beautiful xxxxx
Posted from TSR Mobile 
 Follow
 24
 12052015 19:41
(Original post by Saraaliakaqueen)
Ohmygoodness why didnt i join this website before. You have been so helpful! May u get all the A*s in the world you absolute BABE
Posted from TSR Mobile 
 Follow
 25
 12052015 20:02

 Follow
 26
 12052015 20:17
A couple of (hopefully useful) things for everyone taking the exam tomorrow:
 Parallel lines have the same gradients, as do tangents to curves and circles (at that specific point only). Gradients of straight lines are found from (y2y1)/(x2x1) whereas you use differentiation if it's a curve.
 Perpendicular/normal lines will obey the rule m1 x m2 = 1. The easy way to think of this is "flip and change sign" e.g. if gradient = 3, gradient of normal = 1/3.
 Quadratics with a positive x^2 term show a "smiley face" shaped parabola, negative x^2 terms show a "sad face".
 At stationary/turning points, the gradient is 0.
 If a question asks for a sketch of a graph, show all points on intersection with the axes and, if relevant, turning points. Remember, graphs cross the y axis when x=0 and the x axis when y=0.
 If you're using any sort of formula, it's a good idea to write the formula before you substitute in numbers. If you mess the substitution up, you will still get marks for the correct formula whereas if you don't give the formula, you won't.
 An easy way to find turning points is by completing the square  if you end up with a(x+b)^2 + c, the TP will be at (b, c). Lines of symmetry go through turning points.
 Quadratics in disguise must have two powers on the variables, one of which is double the other. Substitute in y (or whatever you want to call it) for the smaller power and y^2 for the larger power. You must remember to change y back to x (or equivalent, depends on what they give you) when you are finished.
 If you are differentiating a function which consists of two brackets, for example, expand the brackets and then differentiate. You can't differentiate two brackets which multiply each other without using the product rule, and you have to wait until C3 for the excitement of that.
 When curves intersect, put the two equations equal to each other and solve simultaneously.
 Difference of two squares: x^2  25 = (x+5)(x5). Similarly, x^2  any square number will factorise to (x + root of number)(x  root of number).
 Positive square numbers have two roots: the positive and negative root (not sure how to word that). e.g. the square roots of 16 are +4 and 4.
 When applying differentiation, always check your answers with the situation they give you and adjust accordingly. By this I mean things like you can't have a negative area, check whether it states that only integers are possible.
 Always simplify your answers as much as possible. 57/27 = 19/9.
 A quick way to see if an answer is divisible by 3 (or 6, 9 etc) is to see if the digits add up to a number that is divisible by 3. For example, try 2190. 2+1+9+0 = 12, which is divisible by 3 therefore 2190 is also divisible by 3. This won't show you what 2190/3 is (it's 730 btw) but it'll save you time from trying to divide into a number that doesn't divide.
 Never leave anything blank, it's a guaranteed 0. Even writing something gives you the possibility of some marks.
 Check your work at the end (if you have time of course)  don't sit around doing nothing. Silly mistakes are easy and stupid ways to throw away marks and can be easily fixed.
 Exact values mean leave your answer as a surd, in terms of pi etc.
 Probably won't apply much on a noncalculator paper, but the general rule is to give answers to 3sf.
 Remember this is a noncalculator paper, so if halfway through an answer you realise you're ending up with really weird numbers which are going to almost impossible to use later on, look back to see if there's anywhere you could have made an error. Sometimes final answers are 'weird' but the exam isn't designed to test your knowledge of multiplying 36474 by 1745 in the middle of a differentiation question.
 If you have two answers, pick one. I think they have to assume the incorrect one(s) is/are your given answer if you leave multiple answers.
Good luck! 
 Follow
 27
 12052015 20:17
I'm feeling a little more confident with the applications of differentiation now...just worried that if I **** up on a question tomorrow I could end up dropping a grade boundary or two thanks to how high they are.

 Follow
 28
 12052015 20:27
(Original post by scrlk)
I'm feeling a little more confident with the applications of differentiation now...just worried that if I **** up on a question tomorrow I could end up dropping a grade boundary or two thanks to how high they are.
I'm going to madly revise tomorrow at school for C2 with a friend after C1. 
 Follow
 29
 12052015 20:31
(Original post by Peppercrunch)
Are you looking forward to C2 ?
I'm going to madly revise tomorrow at school for C2 with a friend after C1.
C2 is much more interesting than C1.
Saying that I messed it up really badly last year, my exam season was a total disaster with further maths (M2...never again!) and I ended up repeating the AS year which has been pretty dire. 
 Follow
 30
 12052015 21:05
Does anybody know of a thread for C1 for edexcel? Thanks
Posted from TSR Mobile 
 Follow
 31
 12052015 21:07
(Original post by Clovers)
Does anybody know of a thread for C1 for edexcel? Thanks
Posted from TSR Mobile 
 Follow
 32
 12052015 22:40
Just a quick question, when doing the quadratic formula, do you simplify everything on top before dividing through by the denominator (that is if the denominator is a factor)
Posted from TSR Mobile 
 Follow
 33
 12052015 22:51
(Original post by jampot98)
Just a quick question, when doing the quadratic formula, do you simplify everything on top before dividing through by the denominator (that is if the denominator is a factor)
Posted from TSR Mobile 
 Follow
 34
 12052015 23:07
(Original post by chloejessica)
Yeah, easiest to simplify the surd expression then, if possible, cancel with the denominator
Posted from TSR Mobile 
 Follow
 35
 12052015 23:16

 Follow
 36
 12052015 23:47
(Original post by chloejessica)
A couple of (hopefully useful) things for everyone taking the exam tomorrow:
 Parallel lines have the same gradients, as do tangents to curves and circles (at that specific point only). Gradients of straight lines are found from (y2y1)/(x2x1) whereas you use differentiation if it's a curve.
 Perpendicular/normal lines will obey the rule m1 x m2 = 1. The easy way to think of this is "flip and change sign" e.g. if gradient = 3, gradient of normal = 1/3.
 Quadratics with a positive x^2 term show a "smiley face" shaped parabola, negative x^2 terms show a "sad face".
 At stationary/turning points, the gradient is 0.
 If a question asks for a sketch of a graph, show all points on intersection with the axes and, if relevant, turning points. Remember, graphs cross the y axis when x=0 and the x axis when y=0.
 If you're using any sort of formula, it's a good idea to write the formula before you substitute in numbers. If you mess the substitution up, you will still get marks for the correct formula whereas if you don't give the formula, you won't.
 An easy way to find turning points is by completing the square  if you end up with a(x+b)^2 + c, the TP will be at (b, c). Lines of symmetry go through turning points.
 Quadratics in disguise must have two powers on the variables, one of which is double the other. Substitute in y (or whatever you want to call it) for the smaller power and y^2 for the larger power. You must remember to change y back to x (or equivalent, depends on what they give you) when you are finished.
 If you are differentiating a function which consists of two brackets, for example, expand the brackets and then differentiate. You can't differentiate two brackets which multiply each other without using the product rule, and you have to wait until C3 for the excitement of that.
 When curves intersect, put the two equations equal to each other and solve simultaneously.
 Difference of two squares: x^2  25 = (x+5)(x5). Similarly, x^2  any square number will factorise to (x + root of number)(x  root of number).
 Positive square numbers have two roots: the positive and negative root (not sure how to word that). e.g. the square roots of 16 are +4 and 4.
 When applying differentiation, always check your answers with the situation they give you and adjust accordingly. By this I mean things like you can't have a negative area, check whether it states that only integers are possible.
 Always simplify your answers as much as possible. 57/27 = 19/9.
 A quick way to see if an answer is divisible by 3 (or 6, 9 etc) is to see if the digits add up to a number that is divisible by 3. For example, try 2190. 2+1+9+0 = 12, which is divisible by 3 therefore 2190 is also divisible by 3. This won't show you what 2190/3 is (it's 730 btw) but it'll save you time from trying to divide into a number that doesn't divide.
 Never leave anything blank, it's a guaranteed 0. Even writing something gives you the possibility of some marks.
 Check your work at the end (if you have time of course)  don't sit around doing nothing. Silly mistakes are easy and stupid ways to throw away marks and can be easily fixed.
 Exact values mean leave your answer as a surd, in terms of pi etc.
 Probably won't apply much on a noncalculator paper, but the general rule is to give answers to 3sf.
 Remember this is a noncalculator paper, so if halfway through an answer you realise you're ending up with really weird numbers which are going to almost impossible to use later on, look back to see if there's anywhere you could have made an error. Sometimes final answers are 'weird' but the exam isn't designed to test your knowledge of multiplying 36474 by 1745 in the middle of a differentiation question.
 If you have two answers, pick one. I think they have to assume the incorrect one(s) is/are your given answer if you leave multiple answers.
Good luck!
https://8d805163f22accfa62d3038a6f88...20C1%20OCR.pdf 
 Follow
 37
 12052015 23:59
(Original post by Kadak)
How would I do question 10(iii) ?
https://8d805163f22accfa62d3038a6f88...20C1%20OCR.pdfLast edited by jonnydowe; 13052015 at 00:01. 
 Follow
 38
 13052015 00:09
(Original post by jonnydowe)
Differentiate and make dy/dx = 4 as this is the gradient of the straight line find x and y values of this point them sub in this point to find c. 
 Follow
 39
 13052015 00:09
(Original post by Kadak)
How would I do question 10(iii) ?
https://8d805163f22accfa62d3038a6f88...20C1%20OCR.pdf
Gradient of straight line is 4 (y=mx+c) and you can differentiate the curve to get dy/dx = 6x  14. You know this has to equal 4 (tangents have same gradient) therefore 6x  14 = 4, 6x = 18, x = 3. Find the y coordinate at x = 3 by putting back into the equation of the curve: y = 3(3)^2  14(3)  5 = 27  42  5 = 20.
Use these x and y values in the y=4x+c equation to get 20=4(3)+c, c = 32.
Alternatively use y  y1 = m(x  x1)
y + 20 = 4(x  3)
y = 4x  12  20
y = 4x  32, therefore c = 32. 
 Follow
 40
 13052015 00:11
(Original post by chloejessica)
A couple of (hopefully useful) things for everyone taking the exam tomorrow:
 Parallel lines have the same gradients, as do tangents to curves and circles (at that specific point only). Gradients of straight lines are found from (y2y1)/(x2x1) whereas you use differentiation if it's a curve.
 Perpendicular/normal lines will obey the rule m1 x m2 = 1. The easy way to think of this is "flip and change sign" e.g. if gradient = 3, gradient of normal = 1/3.
 Quadratics with a positive x^2 term show a "smiley face" shaped parabola, negative x^2 terms show a "sad face".
 At stationary/turning points, the gradient is 0.
 If a question asks for a sketch of a graph, show all points on intersection with the axes and, if relevant, turning points. Remember, graphs cross the y axis when x=0 and the x axis when y=0.
 If you're using any sort of formula, it's a good idea to write the formula before you substitute in numbers. If you mess the substitution up, you will still get marks for the correct formula whereas if you don't give the formula, you won't.
 An easy way to find turning points is by completing the square  if you end up with a(x+b)^2 + c, the TP will be at (b, c). Lines of symmetry go through turning points.
 Quadratics in disguise must have two powers on the variables, one of which is double the other. Substitute in y (or whatever you want to call it) for the smaller power and y^2 for the larger power. You must remember to change y back to x (or equivalent, depends on what they give you) when you are finished.
 If you are differentiating a function which consists of two brackets, for example, expand the brackets and then differentiate. You can't differentiate two brackets which multiply each other without using the product rule, and you have to wait until C3 for the excitement of that.
 When curves intersect, put the two equations equal to each other and solve simultaneously.
 Difference of two squares: x^2  25 = (x+5)(x5). Similarly, x^2  any square number will factorise to (x + root of number)(x  root of number).
 Positive square numbers have two roots: the positive and negative root (not sure how to word that). e.g. the square roots of 16 are +4 and 4.
 When applying differentiation, always check your answers with the situation they give you and adjust accordingly. By this I mean things like you can't have a negative area, check whether it states that only integers are possible.
 Always simplify your answers as much as possible. 57/27 = 19/9.
 A quick way to see if an answer is divisible by 3 (or 6, 9 etc) is to see if the digits add up to a number that is divisible by 3. For example, try 2190. 2+1+9+0 = 12, which is divisible by 3 therefore 2190 is also divisible by 3. This won't show you what 2190/3 is (it's 730 btw) but it'll save you time from trying to divide into a number that doesn't divide.
 Never leave anything blank, it's a guaranteed 0. Even writing something gives you the possibility of some marks.
 Check your work at the end (if you have time of course)  don't sit around doing nothing. Silly mistakes are easy and stupid ways to throw away marks and can be easily fixed.
 Exact values mean leave your answer as a surd, in terms of pi etc.
 Probably won't apply much on a noncalculator paper, but the general rule is to give answers to 3sf.
 Remember this is a noncalculator paper, so if halfway through an answer you realise you're ending up with really weird numbers which are going to almost impossible to use later on, look back to see if there's anywhere you could have made an error. Sometimes final answers are 'weird' but the exam isn't designed to test your knowledge of multiplying 36474 by 1745 in the middle of a differentiation question.
 If you have two answers, pick one. I think they have to assume the incorrect one(s) is/are your given answer if you leave multiple answers.
Good luck!
Write a reply…
Reply
Submit reply
Updated: May 19, 2015
Share this discussion:
Tweet
Related discussions:
 OCR MEI  C1  13th May 2015
 4762 MEI M2 OCR 13th May 2015
 AS Mathematics C1 MEI 13th of May 2015
 Edexcel C1 13th May 2015 *official thread*
 OCR (Not MEI) S1 Wednesday 8th June 2016
 Your exam discussion threads for 11th  15th May 2015
 A Level Results Day: 13th August 2015: Grade Boundaries.
 AS/A2 Results Day, Thursday 13th August 2015  Official ...
 2015 AS/A2 Results Day (Thursday 13th August)  Official ...
 Post your Alevel exam timetable
TSR Support Team
We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.
This forum is supported by:
 SherlockHolmes
 Notnek
 charco
 Mr M
 TSR Moderator
 Nirgilis
 usycool1
 Changing Skies
 James A
 rayquaza17
 RDKGames
 randdom
 davros
 Gingerbread101
 Kvothe the Arcane
 Airmed
 The Financier
 The Empire Odyssey
 Protostar
 surina16
 nisha.sri
 Reality Check
 claireestelle
 Doonesbury
 furryface12
 Amefish
 harryleavey
 Lemur14
 brainzistheword
 Rexar
 Sonechka
 LeCroissant
 EstelOfTheEyrie
 CoffeeAndPolitics