You are Here: Home >< Maths

# Particular integral watch

1. Hello there,

I require some help with a maths problem.

I need to find the particular integral for a differential equation:

I have worked out the complementary function of the equation, however, I don't know entirely which method to use for the particular integral.

Should I use the y=ax+b method or the exponential method, or a combination of both to find the answer?

(Methods taken from here: http://www.thestudentroom.co.uk/show...00&postcount=4)

Thanks =)
2. The point of finding a complementary function, is that you'll end up on the LHS something you can manipulate with the RHS.

So in this case I would go for

and

A = 1/12 and b = -5/2

I have to say it's been almost 2 years since I've done any FP1 so you never know, I might be wrong.
3. That's great thank you very much. That's a great help =)

Your other post helped me to understand particular integrals a lot more also =)

Thanks
4. I'm glad to see they're still being used . I have to say on first looking at finding particular integrals, it can seem abit of a punch in the dark at which function you choose, but there is a logic to it, which you can see by examples.

### 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: August 4, 2009
The home of Results and Clearing

### 2,939

people online now

### 1,567,000

students helped last year
Today on TSR

### University open days

1. Sheffield Hallam University
Tue, 21 Aug '18
2. Bournemouth University
Wed, 22 Aug '18
3. University of Buckingham
Thu, 23 Aug '18
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