Turn on thread page Beta
    • Thread Starter
    Offline

    9
    ReputationRep:
    I have been doing integration to find the area enclosed between two CURVES. The one I did was the area between y=x^2-4x and y-16-x^2. So its got negative area to add as well. I did the question in 3 steps I mean I had to do integration process 3 times. 1 for negative are 1 for all area above the x axis from -2 to 4 of y=16-x^2 and then 1 for -2 to 0 for y=x^2-4x to take that away from the whole area above the x axis. I knew I could use which I did for previous question do only 1 integration to find as in merging the equations which takes shorter time and it works for this but I throught it wouldn't work because u have got negative area as well so im confused whether to use the method for all questions or to do separately which I find easier but takes long time and disadvantage in exams?
    Offline

    18
    ReputationRep:
    (Original post by Merdan)
    I have been doing integration to find the area enclosed between two CURVES. The one I did was the area between y=x^2-4x and y-16-x^2. So its got negative area to add as well. I did the question in 3 steps I mean I had to do integration process 3 times. 1 for negative are 1 for all area above the x axis from -2 to 4 of y=16-x^2 and then 1 for -2 to 0 for y=x^2-4x to take that away from the whole area above the x axis. I knew I could use which I did for previous question do only 1 integration to find as in merging the equations which takes shorter time and it works for this but I throught it wouldn't work because u have got negative area as well so im confused whether to use the method for all questions or to do separately which I find easier but takes long time and disadvantage in exams?
    If you get a negative area, take the MODULUS of it - i.e. take it as positive instead.
 
 
 
Poll
Do you think parents should charge rent?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

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