Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    16
    ReputationRep:
    (Original post by Arieisit)
    Maybe instead of being condescending you should direct her to some sort of youtube video or website explaining it :unimpressed:
    I realise that you have not been party to the lengthy conversation I have had with the poster via PM
    Offline

    3
    ReputationRep:
    (Original post by TenOfThem)
    I realise that you have not been party to the lengthy conversation I have had with the poster via PM
    Obviously...

    Posted from TSR Mobile
    • Study Helper
    Offline

    16
    ReputationRep:
    (Original post by tify60)
    how to differentiate ?
    If you don't know how to differentiate then you need to go away and investigate some resources that will explain that to you - either a book or an internet resource - prior to tackling this sort of question.

    (Technically you could do the first part without differentiating if you know how to complete the square, but in order to find out the area later on you will need to integrate, and if you haven't covered differentiation yet then I suspect you'll struggle with that part too!)
    Offline

    3
    ReputationRep:
    Spoiler:
    Show
    (Original post by Waffelmeister)
    That's how I'd do it anyway...



    Isn't it against TSR policy to post full solutions in help sections?


    Posted from TSR Mobile
    • Study Helper
    Offline

    16
    ReputationRep:
    (Original post by Waffelmeister)
    That's how I'd do it anyway...
    Please don't post full solutions - it's against the rules of the forum!

    (In this case I suspect your "explanation" won't mean a lot to the OP as he doesn't appear to have come across differentiation anyway )
    Offline

    0
    ReputationRep:
    (Original post by davros)
    Please don't post full solutions - it's against the rules of the forum!

    (In this case I suspect your "explanation" won't mean a lot to the OP as he doesn't appear to have come across differentiation anyway )
    Really? My bad then. I'll take it down then. Also I resent the use of "s. Nothing wrong with it.
    • Study Helper
    Offline

    16
    ReputationRep:
    (Original post by Arieisit)

    Isn't it against TSR policy to post full solutions in help sections?


    Posted from TSR Mobile
    Indeed (as I've just pointed out).

    I don't think it will do any harm here though, since it appears from the OP's contributions so far that he hasn't covered differentiation (and I suspect he'll be even more confused by some of the notation in the "solution" given)
    Offline

    0
    ReputationRep:
    (Original post by Arieisit)


    Isn't it against TSR policy to post full solutions in help sections?


    Posted from TSR Mobile
    Yeah, my apologies, I was unaware of that. I've taken it down.
    Offline

    0
    ReputationRep:
    (Original post by davros)
    Indeed (as I've just pointed out).

    I don't think it will do any harm here though, since it appears from the OP's contributions so far that he hasn't covered differentiation (and I suspect he'll be even more confused by some of the notation in the "solution" given)
    Hey, that's how the French do maths. Works for me. :cool:
    • Study Helper
    Offline

    16
    ReputationRep:
    (Original post by Waffelmeister)
    . Also I resent the use of "s. Nothing wrong with it.
    Nothing wrong with it in the technical sense - the problem is that because you've just written down a sequence of symbols without any accompanying explanation of why you're doing what you're doing, it's only going to be helpful to someone who already understands the basic method and just needs a cross-check. It looks very much from the OP's previous posts as if he won't actually follow your solution, but we'll see
    Offline

    0
    ReputationRep:
    (Original post by davros)
    Nothing wrong with it in the technical sense - the problem is that because you've just written down a sequence of symbols without any accompanying explanation of why you're doing what you're doing, it's only going to be helpful to someone who already understands the basic method and just needs a cross-check. It looks very much from the OP's previous posts as if he won't actually follow your solution, but we'll see
    But that's the boring (although I will admit helpful) bit! Really I should never have ventured onto this bit of the TSR. Oh well, no worries, OP can check answers with it later if he's in a position to later.
    Offline

    2
    ReputationRep:
    (Original post by Waffelmeister)
    ...
    Teach me more about your French ways. I'm eager to learn.
    Offline

    0
    ReputationRep:
    (Original post by Khallil)
    Teach me more about your French ways. I'm eager to learn.
    For me to do that I'd have to know the UK ways, now I would've thought that they were quite similar although going by the reactions here I guess they're maybe not. The French way probably involves more wine drinking and beret wearing, but that's just my personal experience.

    Does anyone know if OP has succeeded? I feel I should be trying to help...
    Offline

    2
    ReputationRep:
    (Original post by Waffelmeister)
    ...
    Fedora tipping too. What were the other members reacting to?
    Offline

    0
    ReputationRep:
    (Original post by brianeverit)
    Minimum p[oint is at x=\frac{a}{2} which givesyou the value of a, then using this in the equation and putting y=-4 will give b.
    I don't understand how you got x= a/2???
    Offline

    18
    ReputationRep:
    (Original post by Waffelmeister)
    For me to do that I'd have to know the UK ways, now I would've thought that they were quite similar although going by the reactions here I guess they're maybe not. The French way probably involves more wine drinking and beret wearing, but that's just my personal experience.

    Does anyone know if OP has succeeded? I feel I should be trying to help...
    Je savais pas il y avait une manière française de faire les mathématiques
    • Study Helper
    Offline

    16
    ReputationRep:
    (Original post by Waffelmeister)
    For me to do that I'd have to know the UK ways, now I would've thought that they were quite similar although going by the reactions here I guess they're maybe not. The French way probably involves more wine drinking and beret wearing, but that's just my personal experience.
    I thought it involved being locked in a prison cell, writing down lots of maths feverishly and then getting shot in a duel.

    And I think the OP has gone away to learn about differentiation
    Offline

    0
    ReputationRep:
    (Original post by L'Evil Fish)
    Je savais pas il y avait une manière française de faire les mathématiques
    Yeah I thought the symbols, notations and methods were pretty much universal but apparently not. :eek:

    (Original post by davros)
    I thought it involved being locked in a prison cell, writing down lots of maths feverishly and then getting shot in a duel.

    And I think the OP has gone away to learn about differentiation
    Ah, well you see that's the 'classes preparatoires' you've got there. *shudders*

    Well that sounds like a fun couple of hours for OP...
    • Study Helper
    Offline

    7
    ReputationRep:
    (Original post by x.Staaarrrrr.x)
    I don't understand how you got x= a/2???
    y=ax^2-ax-b=(x-\frac{a}{2})^2-\frac{a^2}{4}-b by completing the square.
    so y obviously has its minimum value when x-\frac{a}{2}=0 \implies x=\frac{a}{2}
    Offline

    0
    ReputationRep:
    Merci Beacoup! Vous avez compétences excellent!

    Bonsoir!
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What newspaper do you read/prefer?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.