Results are out! Find what you Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Finding the gradient - Parametric equations - SOLVED

Announcements Posted on
Let our uni choice search tool match you with your perfect university 19-11-2015
  1. Offline

    Need some help guys


    The parametric equations of a curve are x=2t^2 and y=4t. Two points on the curve are P(2p^2,4p) and Q(2q^2,4q)

    Show that the gradient of the chord joining the points P and Q is 2/(p+q)

    So i tried by finding the gradient by using y step over x step and i did not get anything like 2/(p+q)

    This is a 2 mark question, so it must be something simple:/

    BTW this is part B of the question

    part a was .. show that the gradient of the normal to the curve at P is -P (I got that right)..
  2. Offline

    Once you have your expression, factorise (difference of two squares)
  3. Offline

    Your method is correct, what did you do. Post your working so we can find the mistake. Remember that x^2-y^2=(x+y)(x-y)
  4. Offline

    you know the gradient is: [4p-4q]/[2p^2-2q^2] = [4(p-q)]/2(p+q)(p-q)]


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  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
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 3, 2012
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.

Today on TSR

Applying to uni

The latest advice and trending discussions are all here

What's your favourite kitchen utensil?
Study resources
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.