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# Fp2 watch

1. I got the right answer for the above question by just letting P = 1/x and Q = rootx then using the other method..

Why have they multiplied by the integration factor? I mean are there particular situations where you use the above method?
2. (Original post by GPODT)

I got the right answer for the above question by just letting P = 1/x and Q = rootx then using the other method..

Why have they multiplied by the integration factor? I mean are there particular situations where you use the above method?
The standard method to solve

involves use of the integrating factor.

Note that you may not use it if you can recognise the derivative of a product on the LHS (if not, the IF will turn it into the derivative of a product).
3. Thanks. I know you use the integrating factor (I did this) but I got the answer without multiplying by the integrating factor. I just wrote it in this form (after finding the integrating factor):

My question is why did they multiply by the integrating factor? And in what situations do you use this?

Posted from TSR Mobile
4. (Original post by GPODT)
Thanks. I know you use the integrating factor (I did this) but I got the answer without multiplying by the integrating factor. I just wrote it in this form (after finding the integrating factor):

My question is why did they multiply by the integrating factor? And in what situations do you use this?

Posted from TSR Mobile
You've done the same thing but in a less explicit way.

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