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fp2 second order differentials question

Hi all,
Today in class we did a question which was to use x=e^u to solve a second order differential in terms of x and y. It was pretty tricky! Will this sort of question come up in an exam? For EDEXCEL


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Avatar for Phichi
Phichi
11
Original post by Mutleybm1996
Hi all,
Today in class we did a question which was to use x=e^u to solve a second order differential in terms of x and y. It was pretty tricky! Will this sort of question come up in an exam? For EDEXCEL


Posted from TSR Mobile


Yes
Original post by Phichi
Yes


Really? My teacher said no..... *confused*


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Reply 3
Avatar for davros
davros
16
Original post by Mutleybm1996
Hi all,
Today in class we did a question which was to use x=e^u to solve a second order differential in terms of x and y. It was pretty tricky! Will this sort of question come up in an exam? For EDEXCEL


Posted from TSR Mobile


I don't know the exact content of FP2 (since I'm "premodular" :smile: ), but this sort of substitution is a fairly standard technique for transforming DEs, so it's worthwhile spending some time trying to get to grips with it.

They can't set questions requiring a ridiculous amount of algebra because that would take too much time, but something like x = e^u is pretty standard IMHO.
Reply 4
Avatar for Goods
Goods
16
Original post by Mutleybm1996
Hi all,
Today in class we did a question which was to use x=e^u to solve a second order differential in terms of x and y. It was pretty tricky! Will this sort of question come up in an exam? For EDEXCEL


Posted from TSR Mobile


If it came up you would be given the substitution.
Reply 5
Avatar for TeeEm
TeeEm
19
Original post by Mutleybm1996
Really? My teacher said no..... *confused*


Posted from TSR Mobile


This type of question last came up on EDEXCEL, June 2014, IAL FP2.
The FP2 syllabus is identical for home students and IAL

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