You are Here: Home

# C3 ocr mei june 21st 2012 Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

Announcements Posted on
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. Re: C3 ocr mei june 21st 2012
(Original post by Jam')
y=2f(x) -> stretch in the y-axis, scale factor 2, so yes, you multiply by 2.

y=f(x)+2 -> translation by 1 unit in the positive y-direction.
I think you mean 2 units for the last one.
2. Re: C3 ocr mei june 21st 2012
(Original post by Tedfoo25)
I think you mean 2 units for the last one.
HA yeah lol thanks
3. Re: C3 ocr mei june 21st 2012
(Original post by Alasda1r)
The way I did the proof was to say, if s(x) is odd the -s(x)= s(-x)
So,
-s(x)= -(f(x) + g(x))
= -f(x) + - g(x)
Since f(x) and g(x) are odd ( as you are told in the question)
= f(-x) + g(-x)
= s(-x)
Hence odd
The proof was standard I thought, basically, if s(x) =f(x) + g(x)

It tells you both f(x) and g(x) are odd, so
s(-x) = f(-x) + g(-x)
= -f(x) - g(x)
= - (f(x) + g(x)) = -s(x) so it's odd

next part was f(x) * g(x) well two negative times together to get a positive, so it's positive and hence even.
4. Re: C3 ocr mei june 21st 2012
(Original post by hprmc)
hhaha... how did you get your 1.5 ? cos i actually got -1.5 haha. im scared ive lost all the marks for the question
I got -1.5 by integrating tangent, then integrating the original graph, then taking the area of the graph away from the tangent.
Ah yeah sorry -1.5 because then when you taken them away you actually add, sorry I missed that slight detail there haha x
5. Re: C3 ocr mei june 21st 2012
(Original post by SS*)
What question was this? I have the paper.
Do you still have the june 2012 paper?
Useful resources

## Articles:

Study Help rules and posting guidelinesStudy Help Member of the Month nominations

## Groups associated with this forum:

View associated groups
Moderators

We have a brilliant team of more than 60 volunteers looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is moderated by:
Reputation gems:
The Reputation gems seen here indicate how well reputed the user is, red gem indicate negative reputation and green indicates a good rep.
Post rating score:
These scores show if a post has been positively or negatively rated by our members.