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

C4 parametric equation help watch

1. I haven't ventured to the bottom to have a look at the mark scheme (because that doesn't normally help at all), but i'm so confused about what i'm supposed to do part 1 and how i'm supposed to do it. I realise it's probably fairly straight forward, but i just can't get my head around it.

2. Post the question, for those of us without integral logins.
3. (Original post by CharleyChester)
http://integralmaths.org/resources/f...apers/C4-A.pdf Question 5.

I haven't ventured to the bottom to have a look at the mark scheme (because that doesn't normally help at all), but i'm so confused about what i'm supposed to do part 1 and how i'm supposed to do it. I realise it's probably fairly straight forward, but i just can't get my head around it.

Would you be able to copy out the question? I can't see it as you need to login to integral maths
4. (Original post by TimmonaPortella)
Post the question, for those of us without integral logins.

(Original post by jameswhughes)
Would you be able to copy out the question? I can't see it as you need to login to integral maths
Sorry! I forgot about the log-in thing. I screen captured the picture and put the link in the original post.

5. For tangent

where

Use and as given, and so

so therefore

You now have a line,
and to find where it crosses the x axis,
so

I'll do N later, go to go now!
6. (Original post by CharleyChester)

I haven't ventured to the bottom to have a look at the mark scheme (because that doesn't normally help at all), but i'm so confused about what i'm supposed to do part 1 and how i'm supposed to do it. I realise it's probably fairly straight forward, but i just can't get my head around it.

If the question was just

"A point P on the curve f(x) = (equation) has coordinates (x,y).
i) Find the coordinates of the point where the tangent meets the x-axis,
ii) Find the coordinates of the point where the normal meets the x-axis"

would you know how to go about it? It's the same method, but with parametric coordinates instead of cartesian. You should know how to find the gradient of a curve defined parametrically.
7. For the normal, repeat what I did earlier, with because the normal is perpendicular to the tangent, so the gradient is the negative inverse.

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 11, 2011
Today on TSR

Loughborough better than Cambridge

Loughborough at number one

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

Chat with other maths applicants