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    Evaluate the length of the curve f(x)=(x^3)/3 + 1/(4x), between the interval 1<x<2.
    help
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    (Original post by Simbo)
    Evaluate the length of the curve f(x)=(x^3)/3 + 1/(4x), between the interval 1<x<2.
    help
    what do u mean,do what to find the curve length between x=1 and x=2?
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    (Original post by Simbo)
    Evaluate the length of the curve f(x)=(x^3)/3 + 1/(4x), between the interval 1<x<2.
    help
    explain
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    use the equation supplied below, where S is the length of the line.

    dy/dx = x²-1/4x²
    (dy/dx)² = x^4 - 1/2 + 1/16x^4
    1+(dy/dx)² = x^4 + 1/2 + 1/16x^-4 = (x²+1/4x²)²
    sqrt(1+(dy/dx)²) = x²+1/4x²

    integral = x³/3 - 1/4x + C

    within limits [1,2] = 8/3 - 1/8 - 1/3 + 1/4 = 53/24 units
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    Ooh, this is P5. I should know this...
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    (Original post by elpaw)
    use the equation supplied below (i.e. S=\int_1^2\sqrt{1+(\frac{dy}{dx} )^2}dx in LaTeX format), where S is the length of the line.

    dy/dx = x²-1/4x²
    (dy/dx)² = x^4 - 1/2 + 1/16x^4
    1+(dy/dx)² = x^4 + 1/2 + 1/16x^-4 (x²+1/4x²)²
    sqrt(1+(dy/dx)²) = x²+1/4x²

    integral = x³/3 - 1/4x + C

    within limits [1,2] = 8/3 - 1/8 - 1/3 + 1/4 = 53/24 units
    Elpaw, what module is this in?
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    (Original post by bono)
    Elpaw, what module is this in?
    P5 on Edexcel
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    (Original post by hornblower)
    Ooh, this is P5. I should know this...
    Ahhh right, no wonder then. :rolleyes:
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    (Original post by elpaw)
    P5 on Edexcel
    So it would be about P6 or P7 on AQA B then.

    EDIT: Elpaw, just out of curiousity, what UMS scores did you get for P1, P2 and M1?
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    (Original post by bono)
    So it would be about P6 or P7 on AQA B then.

    EDIT: Elpaw, just out of curiousity, what UMS scores did you get for P1, P2 and M1?
    It's on P6 (section 15.4 on the specification)
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    (Original post by elpaw)
    It's on P6 (section 15.4 on the specification)
    Ahhh right, cheers.

    BTW: Please answer my question.
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    100, 96, 100
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    (Original post by elpaw)
    100, 96, 100
    Right, can I just ask, do you need 100% raw in order to obtain max UMS? How much can you drop?

    BTW: Fab scores there
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    (Original post by bono)
    Right, can I just ask, do you need 100% raw in order to obtain max UMS? How much can you drop?

    BTW: Fab scores there
    apparently you can drop quite a few marks and still get 100UMS
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    (Original post by elpaw)
    apparently you can drop quite a few marks and still get 100UMS
    Wow, cool.

    What was your lowest UMS out of your Maths and Further Maths A-Levels then?
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    (Original post by elpaw)
    100, 96, 100
    Well done, that's pretty amazing. That's my target for P1 and M1 as well.
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    ooo p5 very nasty
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    84 on S3 (i didnt bother with the coursework)
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    (Original post by mik1a)
    Well done, that's pretty amazing. That's my target for P1 and M1 as well.
    P2 on my syllabus is a breeze, honest!
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    (Original post by elpaw)
    84 on S3 (i didnt bother with the coursework)
    Ahhh right. That is digraceful Elpaw! Shame on you!
 
 
 
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