STEP 3 2018 Q3 Question
Hello, as the title suggests, I wanted to ask about a particular STEP question, specifically finding equation (*). The mark scheme just wants you to demonstrate solutions exist by solving simultaneous equations, but why is (*) assumed? As it does not seem to make intuitive sense, so I was wondering if anybody could guess why we assume it can be written as nested derivatives?
Reply 1
21
Original post
by MathsEnjoyerHello, as the title suggests, I wanted to ask about a particular STEP question, specifically finding equation (*). The mark scheme just wants you to demonstrate solutions exist by solving simultaneous equations, but why is (*) assumed? As it does not seem to make intuitive sense, so I was wondering if anybody could guess why we assume it can be written as nested derivatives?
If you had
(x^2 y)''
then that would be a particular case of the lhs of the ode, so something like
x^2 y'' + 4xy' + 2y
Then just integrate twice and divide by x^2. The form they give is similar, although more general.
(edited 1 year ago)
Reply 2
Empty reply, because I wrote a page long reply, edited it and half of it has disappeared. Thanks TSR...
Quick Reply
Related discussions
- STEP 2025 Solutions and Reconstruction
- personal statement again
- English Lang
- Civil Service Degree Apprenticeship Personal Statement
- AQA A-level English Language Paper 2 - 4th June 2025 [Exam Chat]
- new style personal statement questions - section 3
- GAMSAT 2025 / 2026 entry discussions megathread
- STEP-help !!
- How to make Q2 of new personal statement look good?
- Personal statement
- Info regarding EPQ's
- Personal statement help
- AQA A-level English Language Paper 1 (7702/1) - 23rd May 2024 [Exam Chat]
- How to answer English Lit and Lang Questions
- Unit 4 activity 3 health and social care
- UCAS PS Q2 Help
- What quesion does Work experience fit under
- Edexcel AS level maths 2025 Pure Exam chat
- STEP Maths I, II, III 1989 solutions
- Personal Statement Help - Access to HE
Latest
Trending
Last reply 3 months ago
Methods of rationalisation of denominators of complex numberLast reply 3 months ago
Which A-level Maths/Further Maths topics gave you the most trouble?Posted 4 months ago
Pls help me pls im acc gonna die pls pls help me AS EDEXCEL MATHSLast reply 4 months ago
Grade Boundaries Edexcel Further Maths 3A 3C (FP1 & FM1)Last reply 4 months ago
Edexcel AS Level Maths May 15th 2025 Pure Paper 1 + Unofficial Mark SchemeMaths Study Help
68
160
How The Student Room is moderated
To keep The Student Room safe for everyone, we moderate posts that are added to the site.
