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    I believe I got something like 15x + 14y + 63 = 0

    Just seemed a little odd at the time. IS that roughly what you got?
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    (Original post by candy88524)
    but the coords are (5,3) so r= 9
    no the centre cordinates were (5,13) and coz the circle touched the x-axis the radius was 13 as well.

    (Original post by jonnymcc2003)
    I believe I got something like 15x + 14y + 63 = 0

    Just seemed a little odd at the time. IS that roughly what you got?
    sorry but I do not have a clue what I got in the end!
    rosie
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    (Original post by jonnymcc2003)
    I believe I got something like 15x + 14y + 63 = 0

    Just seemed a little odd at the time. IS that roughly what you got?
    for that question i got a wierd tangent equation where the gradient i got was zero???? strange! i messed that question up and i think i dropped 3 marks on that part of question.
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    hey guys soz, but i think im confusing everyone here! did you do all do the edexcel P3 paper? cause that was the one i was talking about.
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    that questions was annoying but there was a sneaky trick to it.
    Just find the gradient from centre to the point specified. You thats a normal to the tangent. Then u know the gradient of that tangent. The examiners wanted you to implictily diff. But you could do using p1 knowledge.
    Kinda takes the piss a bit

    (Original post by XYTER)
    that questions was annoying but there was a sneaky trick to it.
    Just find the gradient from centre to the point specified. You thats a normal to the tangent. Then u know the gradient of that tangent. The examiners wanted you to implictily diff. But you could do using p1 knowledge.
    Kinda takes the piss a bit
    or, i think, you could just use the (h,k) method (i hope!) which although not p3 is quite easy...

    I wondered why there wasnt any implicit differentiation on it!!
    rosie
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    (Original post by Meeps)
    no the centre cordinates were (5,13) and coz the circle touched the x-axis the radius was 13 as well.
    13....i'm so sure it was 3.....does anyone have the paper to confirm!
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    (Original post by ladoooo)
    Has anyone got the question paper for edexcel by any chance?? or the actual questions??
    ive got the full paper right here
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    (Original post by XYTER)
    that questions was annoying but there was a sneaky trick to it.
    Just find the gradient from centre to the point specified. You thats a normal to the tangent. Then u know the gradient of that tangent. The examiners wanted you to implictily diff. But you could do using p1 knowledge.
    Kinda takes the piss a bit
    yeh i always used to do that but i learnt this tangent formula the day before for any specific point (h,k) on the circle. i tried using that but i guess it didnt work!

    it was like the first time i did and i like panicked after and forgot to do it the way i was taught!
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    (Original post by lexazver203)
    ive got the full paper right here
    Can you scan in maybe? And the radius of the circle was '13', because it touched the x axis and centre was (x,13).
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    (Original post by candy88524)
    13....i'm so sure it was 3.....does anyone have the paper to confirm!
    i'm pretty sure it was 13...
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    (Original post by capslock)
    Can you scan in maybe? And the radius of the circle was '13', because it touched the x axis and centre was (x,13).
    i got radius beeing as ,/194
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    (Original post by mockel)
    i'm pretty sure it was 13...

    The circle C has centre (5,13) and touches the x axis
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    (Original post by lexazver203)
    i got radius beeing as ,/194
    Then you are wrong.
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    (Original post by lexazver203)
    ive got the full paper right here
    you couldnt scan the paper and post it here for us to have look again can you please?
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    (Original post by capslock)
    Then you are wrong.
    not the 1st time

    (Original post by candy88524)
    13....i'm so sure it was 3.....does anyone have the paper to confirm!
    even if it was 3, how does that make the radius 9?

    I remember it as being 13 too

    rosie
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    r there curves in alevels and do u think p3 will have a high curve??
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    radius was definitely 13
 
 
 

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