x Turn on thread page Beta
 You are Here: Home >< Maths

# OCR (not MEI) C1 - Wednesday 13th May 2015 watch

Im still abit muddled on stationary points,increasing and decreasing fucntions and when to use the second deritive ?
Stationary points -> dy/dx = 0.
For increasing functions, the gradient will be positive and for decreasing functions, the gradient will be negative.
The second derivative (d2y/dx2) is used to find the nature of a stationary point, i.e. whether it is a maximum or a minimum, or point of inflection but these are less common. Differentiate once to get dy/dx then differentiating this again will give you the second derivative.
Substitute in the value for x where the turning point is, and if d2y/dx2 is positive -> minimum point and if negative -> maximum point.
If the result of the second derivative is 0, you need to test two points either side of the stationary point (as close to it as possible) and determine whether the gradients there are +ve or -ve. If the gradient goes +ve -> SP -> -ve, the point is a max.
If it goes -ve -> SP -> +ve, the point is a min. If the two points both have +ve gradients or both have -ve gradients, it's a point of inflection.
2. (Original post by chloe-jessica)
Stationary points -> dy/dx = 0.
For increasing functions, the gradient will be positive and for decreasing functions, the gradient will be negative.
The second derivative (d2y/dx2) is used to find the nature of a stationary point, i.e. whether it is a maximum or a minimum, or point of inflection but these are less common. Differentiate once to get dy/dx then differentiating this again will give you the second derivative.
Substitute in the value for x where the turning point is, and if d2y/dx2 is positive -> minimum point and if negative -> maximum point.
If the result of the second derivative is 0, you need to test two points either side of the stationary point (as close to it as possible) and determine whether the gradients there are +ve or -ve. If the gradient goes +ve -> SP -> -ve, the point is a max.
If it goes -ve -> SP -> +ve, the point is a min. If the two points both have +ve gradients or both have -ve gradients, it's a point of inflection.

Posted from TSR Mobile
Ty so much! I'm going to bed now 😃.Good night and goodluck tomorrow.
Posted from TSR Mobile
Ty so much! I'm going to bed now 😃.Good night and goodluck tomorrow.
I should probably head to bed too 🙈 best of luck with the exam
4. What did everyone think of the exam?
It went well for me, I just hope the grade boundaries aren't too high.

Posted from TSR Mobile
5. (Original post by jampot98)
What did everyone think of the exam?
It went well for me, I just hope the grade boundaries aren't too high.

Posted from TSR Mobile
I think it went quite well - hopefully anyway
6. Easy exam so I think I made a load of mistakes. I suspect grade boundaries will be high
7. It went pretty well, even though I know I screwed up one of the indices questions. Lots of disagreement at college about the last question though
8. General consensus at my school is that the answer was 40

Yeah, I found the paper easier than last year's...fearing high grade boundaries.
9. Last question? 40 or 50
10. what did everyone get for the last question..area of triangle one ???
11. (Original post by ella_chloe)
Last question? 40 or 50
Pretty much everyone at my college got 40 but used loads of different methods to get that
12. (Original post by freyfreyy96)
Pretty much everyone at my college got 40 but used loads of different methods to get that

(Original post by lily9666768)
what did everyone get for the last question..area of triangle one ???

(Original post by ella_chloe)
Last question? 40 or 50
I got 40 too, using 1/2b x h
13. (Original post by lily9666768)
what did everyone get for the last question..area of triangle one ???
I got 40

But I thought that was a really good paper
14. (Original post by AstroNandos)
I got 40

But I thought that was a really good paper
Did you get k > 25/8 ?
15. What did you guys get for the other stationary point
16. What did everyone get for question 6, the simultaneous equation one??
17. (Original post by Dentist214)
What did you guys get for the other stationary point
X=1/3

Posted from TSR Mobile
18. (Original post by Dentist214)
What did you guys get for the other stationary point
Like a third
19. (Original post by Dentist214)
What did you guys get for the other stationary point
2 & 14/3 I think.
20. What did people get for the equation of the line through the mid point of AB?

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:
Updated: May 19, 2015
Today on TSR

### Negatives of studying at Oxbridge

What are the downsides?

### Grade 9 in GCSE English - AMA

Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE