You are Here: Home >< Maths

# Integration watch

1. 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?
2. (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.

### Related university courses

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: January 22, 2014
Today on TSR

### Exam Jam 2018

Join thousands of students this half term

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