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    Hi I just wanted to know if i differentiate x= (y-1)/-2 does the -2 at the bottom be affected? Would dx/dy be - 1/2?
    Thanks
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    (Original post by thequackingduck)
    Hi I just wanted to know if i differentiate x= (y-1)/-2 does the -2 at the bottom be affected? Would dx/dy be - 1/2?
    Thanks
    yes
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    Cheers! There was me trying to differentiate the -2 too haha
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    How would i rearrange x^2 lnx = y to get x as the subject
    I'm just unsure on how to get rid of the ln
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    (Original post by thequackingduck)
    How would i rearrange x^2 lnx = y to get x as the subject
    I'm just unsure on how to get rid of the ln
    apply fallowing derivative formulas

    d/dx (uv) = (u dv/dx ) + ( v du/dx )

    d/dx x^n = n x^(n-1)

    d/dx (ln x) = 1/x
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    (Original post by thequackingduck)
    How would i rearrange x^2 lnx = y to get x as the subject
    I'm just unsure on how to get rid of the ln
    I do not think you can - are you sure that you need to
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    (Original post by thequackingduck)
    How would i rearrange x^2 lnx = y to get x as the subject
    I'm just unsure on how to get rid of the ln
    You can't get x as the subject of that!

    Why do you think you need to?
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    I guess I can't do that then haha no wonder it was hard lol
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    (Original post by thequackingduck)
    I guess I can't do that then haha no wonder it was hard lol
    Why were you trying?
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    How do i differentiate √9-y (all of it is square rooted) with the limits of 0 and 9
    I can't believe that I'm stuck on this, I'm disappointed in myself. Thanks.
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    (Original post by thequackingduck)
    How do i differentiate √9-y (all of it is square rooted) with the limits of 0 and 9I can't believe that I'm stuck on this, I'm disappointed in myself. Thanks.
    That doesn't make sense! Are you trying to differentiate or integrate?
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    Oh sorry i meant integrate!! My bad!
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    (Original post by thequackingduck)
    Oh sorry i meant integrate!! My bad!
    Well do you know how to integrate \sqrt{y} with respect to y? It's exactly the same principle
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    Yeah but I've just forgotten that's the thing. I honestly don't know why ha, once I see the solution I'll be kicking myself lol
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    (Original post by thequackingduck)
    Yeah but I've just forgotten that's the thing. I honestly don't know why ha, once I see the solution I'll be kicking myself lol
    Well, what's the integral of \sqrt{y} for a start?
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    Sqrt(9-y)
    Limits of 0 to 9
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    Any help?
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    (Original post by thequackingduck)
    Any help?
    You haven't answered my question yet

    What's the integral of \sqrt{y} ?
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    The integral of a smiley face?!
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    (Original post by thequackingduck)
    The integral of a smiley face?!
    Are you actually going to do any work on this or have you stopped trying now?
 
 
 
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