You are Here: Home >< Maths

# C1 - coordinate geometry Watch

1. How do I do part d? Any hints on how to start?
Thanks
Attached Images

2. (Original post by Super199)
How do I do part d? Any hints on how to start?
Thanks
Just sub p into the equation, if it is = to 0 then it satisfies.
3. (Original post by zed963)
Just sub p into the equation, if it is = to 0 then it satisfies.
What equation?
4. (Original post by Super199)
What equation?
p^2-4p-16=0
5. (Original post by zed963)
p^2-4p-16=0
I don't know the value of p .
I am given AC. Where A is (2,5) and c is (p, some y coordinate) which is equal to 5? It's worth 4 marks so I dunno
6. (Original post by Super199)
I don't know the value of p .
I am given AC. Where A is (2,5) and c is (p, some y coordinate) which is equal to 5? It's worth 4 marks so I dunno
It clearly says " has x coordinate which is equal to p"

Post your working out to the question.
7. What is the coordinates of point C in terms of p?

What is the length of AC in terms of p?

Answer those and you should be able to solve the rest.
8. (Original post by zed963)
Just sub p into the equation, if it is = to 0 then it satisfies.
You cannot do this, you don't know what p is yet.
9. (Original post by james22)
You cannot do this, you don't know what p is yet.
10. (Original post by james22)
What is the coordinates of point C in terms of p?

What is the length of AC in terms of p?

Answer those and you should be able to solve the rest.
If I could work out the y coordinate of p I should be able to do this. I can't seem to work it out.
Then for AC I would say
?
11. (Original post by Super199)
If I could work out the y coordinate of p I should be able to do this. I can't seem to work it out.
Then for AC I would say
?

I've tried doing it but its not as easy as it looks.

Posted from TSR Mobile
12. (Original post by Super199)
If I could work out the y coordinate of p I should be able to do this. I can't seem to work it out.
Then for AC I would say
?
You know what the y coordinate will be in terms of p because C lies on the line and you worked out the equation of the line earlier in the question.
13. (Original post by davros)
You know what the y coordinate will be in terms of p because C lies on the line and you worked out the equation of the line earlier in the question.
Oh wow yh hang on I will have another go. Thanks
14. I have the solution to this? Want hints?
15. C= (P,-1/2P+6)
16. You then plug this into the AC^2 formula
17. (Original post by zed963)
RTFQ
18. (Original post by Galileo Galilei)
C= (P,-1/2P+6)
Can you explain where you've got this from?
19. (Original post by james22)
RTFQ
Sorry guys.
20. (Original post by zed963)
Can you explain where you've got this from?
Mathematical logic

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: April 16, 2014
Today on TSR

### 8 things that will happen during Freshers

Don't say we didn't warn you...

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams