You are Here: Home

# C1 MEI Wednesday 16th May 2012

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
1. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
Aspiring

P: y^3 >1
Q: y>1

which way does arrow go if any?
q<=>p
2. Re: C1 MEI Wednesday 16th May 2012
Ahhh fair, and thanks you too!
3. Re: C1 MEI Wednesday 16th May 2012
(Original post by AspiringGenius)
So can anybody ask me some questions please, some harder ones to get my mind in the set for mathsy?
i) The centre of a circle lies on the midpoint of A(3,5) and B(7,9)
Given that the point (1,4) lies on the circumference of this circle, find the radius, and hence, the equation of the circle.

ii) Using the radius obtained in part i), state the equation of another circle of which the point (1,4) lies on the circumference.

Look, I even made the questions MEI-ish! I hope they're reasonably difficult, or at least at Section B standard!
4. Re: C1 MEI Wednesday 16th May 2012
I am retaking this tomorrow after scoring 78 last exam, not revised massively but am confident as I only scored (relatively low) because I panicked as oppose to any gaping holes in knowledge.

Hope to be able to answer everything and score high :-) good luck all!
5. Re: C1 MEI Wednesday 16th May 2012
Quite interesting is that so many in here re-take it even though they're already achieved B, I wonder why. I had D in back then and I am retaking it in hopes of B to A.
6. Re: C1 MEI Wednesday 16th May 2012
(Original post by Rtcw)
Quite interesting is that so many in here re-take it even though they're already achieved B, I wonder why. I had D in back then and I am retaking it in hopes of B to A.
Get easy UMS - every little helps, especially when it comes to getting the full A-level.
7. Re: C1 MEI Wednesday 16th May 2012
(Original post by xfearless)
q<=>p
correct
8. Re: C1 MEI Wednesday 16th May 2012
Lol RTCW has turned up here after his disgraceful post which you can read below:

http://www.thestudentroom.co.uk/show...630&p=37563478
9. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
Lol RTCW has turned up here after his disgraceful post which you can read below:

http://www.thestudentroom.co.uk/show...630&p=37563478
'lethaless'- that's an interesting word, can't say I've come across it before.
10. Re: C1 MEI Wednesday 16th May 2012
i hate thoes <=> things. can someone please explain it to me?
11. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
Lol RTCW has turned up here after his disgraceful post which you can read below:

http://www.thestudentroom.co.uk/show...630&p=37563478
How is this related to this thread?
12. Re: C1 MEI Wednesday 16th May 2012
(Original post by LosMutos)
i hate thoes <=> things. can someone please explain it to me?
P=>Q This means P implies Q, so the details of P imply that the details of Q are correct. For example, if P is 'a square' and Q is 'a quadrilateral with 4 equal sides', then P implies Q as a square must meet the requirements of Q in order to be a square. However, Q doesn't imply P because a rhombus is also a quadrilateral with four equal sides.

P<=Q This means P is implied by Q, so the details of Q imply that the details of P are correct. This is essentially the reverse of the above.

P<=>Q This means P implies and is implied by Q, so the details of Q and P imply each other, and are interdependent. For example, if P is 'a square' and Q is 'a quadrilateral with four equal sides and four right angles', P and Q imply each other.

Hope that helps a little...
13. Re: C1 MEI Wednesday 16th May 2012
(Original post by jordan95)
P=>Q This means P implies Q, so the details of P imply that the details of Q are correct. For example, if P is 'a square' and Q is 'a quadrilateral with 4 equal sides', then P implies Q as a square must meet the requirements of Q in order to be a square. However, Q doesn't imply P because a rhombus is also a quadrilateral with four equal sides.

P<=Q This means P is implied by Q, so the details of Q imply that the details of P are correct. This is essentially the reverse of the above.

P<=>Q This means P implies and is implied by Q, so the details of Q and P imply each other, and are interdependent. For example, if P is 'a square' and Q is 'a quadrilateral with four equal sides and four right angles', P and Q imply each other.

Hope that helps a little...
Oh I see. Thank you very much
14. Re: C1 MEI Wednesday 16th May 2012
Could someone explain how to go about questions like this?
Find the real roots of the equation x^4-5x^2-36=0 by considering it as a quadratic equation in x^2
I'm not sure what they're really asking me to do.
15. Re: C1 MEI Wednesday 16th May 2012
(Original post by xfearless)
Could someone explain how to go about questions like this?
Find the real roots of the equation x^4-5x^2-36=0 by considering it as a quadratic equation in x^2
I'm not sure what they're really asking me to do.
When you put a, b and c into the quadratic equation, see what number the discriminant (the bit under the square root) is. If it's greater than 0, it has 2 roots, if it is 0 then it has 1 root and if it's less than 0 it has none. You can just carry on with the equation to then find the roots
16. Re: C1 MEI Wednesday 16th May 2012
x^4-5x^2-36=0

you pretend it is a x^2 equation and use the quadratic formula
so: a = 1, b = -5 and c = -36
and you go from there to see if it has real roots or not

(or that is what i would do, anyone feel free to correct me)

(Original post by xfearless)
Could someone explain how to go about questions like this?
Find the real roots of the equation x^4-5x^2-36=0 by considering it as a quadratic equation in x^2
I'm not sure what they're really asking me to do.
17. Re: C1 MEI Wednesday 16th May 2012
(Original post by xfearless)
Could someone explain how to go about questions like this?
Find the real roots of the equation x^4-5x^2-36=0 by considering it as a quadratic equation in x^2
I'm not sure what they're really asking me to do.
You have to treat it like a quadratic, where you could have (x+a)(x-b). However, as it is a quartic equation your factorisation must be of the form (x^2+a)(x^2-b) because x^2 multiplied by x^2 gives x^4 but bear in mind I'm using +a and -b purely to illustrate the generic form.
18. Re: C1 MEI Wednesday 16th May 2012
ah great, thank you both!
19. Re: C1 MEI Wednesday 16th May 2012
anyone got any tips on how to do the best i can
20. Re: C1 MEI Wednesday 16th May 2012
Hi again guys. Real quick question when diving a square root by 2 such as in the -b+- b2-4ac
------------
2a

If the number in the square root was 68 then divided it by 2, is it the same as dividing the number in the sqaure root by 4?

What abouts if the a=2 so you were dividing the sqaure root by4 ? would it be the same as dividing the number in the sqaure root by 16? :L Hope you guys know where i'm coming from, its just for simplifying an answer.

Also, is anyone going to post an unnoficial mark scheme after the exam tommorow? :P

## Step 2: Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank

this is what you'll be called on TSR

2. this can't be left blank

never shared and never spammed

3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. By completing the slider below you agree to The Student Room's terms & conditions and site rules

2. Slide the button to the right to create your account

You don't slide that way? No problem.

Last updated: May 17, 2012
Useful resources

## Articles:

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

## Groups associated with this forum:

View associated groups
Study resources
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:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.
Post rating score:
These scores show if a post has been positively or negatively rated by our members.