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M4 moment of inertia Watch

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    on question 5, i have done the first part and got
    \sqrt{\dfrac{3ga}{l^2+3a^2}}
    on the second part i used differentiation,i did get the answer right,however i had to use a formula which ive never learnt be4 from the formulae booklet
    \dfrac{dy}{dx}=\dfrac{f'(x)g(x)-f(x)g'(x)}{(g(x))^2}
    is there any other way of finding this value of a? because ive never learnt that formula before

    EDIT:ive learnt this before ive just forgotten it,its late and i havent slept so my problem solving is messy
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    you're doing m4 and you've never learnt the quotient rule before? :hmmm:

    I smell a troll!
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    (Original post by rock_climber86)
    you're doing m4 and you've never learnt the quotient rule before? :hmmm:

    I smell a troll!
    oh i remember this,it was in core 3,thanks,i have learnt this last month,i just forgot about it since i moved on pretty quickly to C4,

    im afraid what you smell is not a troll :P
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    (Original post by physics4ever)
    oh i remember this,it was in core 3,thanks,i have learnt this last month,i just forgot about it since i moved on pretty quickly to C4,

    im afraid what you smell is not a troll :P
    Too early in the morning for maths for you then :hmmm:
 
 
 
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