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# second order differencec eqn watch

1. in theory do i actually need the constant A to be given or could i work it out by simultaneous methods?

https://cdn.discordapp.com/attachmen...80/unknown.png
2. (Original post by will'o'wisp2)
in theory do i actually need the constant A to be given or could i work it out by simultaneous methods?

https://cdn.discordapp.com/attachmen...80/unknown.png
I see no constant A in your attachment. Regardless of that, knowing p0 and p1 is enough to completely determine the solution.
3. (Original post by DFranklin)
I see no constant A in your attachment. Regardless of that, knowing p0 and p1 is enough to completely determine the solution.
Sorry i was going off my notes. the constant i deem "A" is 307 and i just worked it out. Horrible bit of work if you don't sub and try and work each bit out. :P It's 307.3.... so ye noice

Thanks man
4. (Original post by will'o'wisp2)
Sorry i was going off my notes. the constant i deem "A" is 307 and i just worked it out. Horrible bit of work if you don't sub and try and work each bit out. :P It's 307.3.... so ye noice
Just a matter of "practicality", it's almost certainly easiest here to simply apply the recurrence twice to find P2 and then P3. It's something a GCSE student could do, but it's also the least calculation.

Edit: and to be clear, in that case you never need to work out the "correct" value for A.
5. (Original post by DFranklin)
Just a matter of "practicality", it's almost certainly easiest here to simply apply the recurrence twice to find P2 and then P3. It's something a GCSE student could do, but it's also the least calculation.

Edit: and to be clear, in that case you never need to work out the "correct" value for A.
Oh right.

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