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

Trapezium Rule C2 AQA

Announcements Posted on
Has your uni kept its promises? Vote now to have your say (you could even win an Apple Watch). 29-05-2015
  1. Offline

    This should be simple but I can't get to the right answer.

    Q) Using the trapezium rule with 3 ordinates, find an estimate for the area under the curve y = x^2 - 3x from x = 4 to x = 8.

    If there are 3 ordinates, you do 4 (8-4) divided by 3 right? I think that's where I'm going wrong. Then input 4+1.333 and the answer of that + 1.333 as my middle ordinates then x=4 and x=8 as my end points, so I get:

    4 + 2(12.44 + 24.44) + 40 giving me 117... the answer is apparently 80.
  2. Offline

    you need to do with x = 4,6,8 which would mean that h=2

    then you use the trapezium rule with those values.
  3. Offline

    Doing so, I still only get 24. Where am I going wrong?
  4. Offline

    did you use this formulae:


    where h = difference in the x values = 2
    y0 = y value at x = 4
    y1 = y value at x = 6
    yn = y value at x = 8


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: April 19, 2012
New on TSR

Taxing sugar

Should sweet foods subsidise healthy ones?

Study resources
Article updates

Think you’ll be in clearing or adjustment?

Hear direct from unis that want to talk to you

Get email alerts for university course places that match your subjects and grades. Just let us know what you’re studying.

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.