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    Stuck on question 3? Any help please
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    Stuck on question 3? Any help please
    What have you tried? The trickiest bit is the initial step I imagine, then the rest is as difficult as the earlier questions.
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    (Original post by Kevin De Bruyne)
    What have you tried? The trickiest bit is the initial step I imagine, then the rest is as difficult as the earlier questions.
    k(x+h) -kx
    —————
    h



    is this right?
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    (Original post by poppydoodle)
    k(x+h) -kx
    —————
    h



    is this right?
    Yes. Now you can simplify the numerator.
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    (Original post by Notnek)
    Yes. Now you can simplify the numerator.
    kx + kh- kx
    ——————
    h

    =

    kx + k - kx

    = k ???
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    (Original post by poppydoodle)
    kx + kh- kx
    ——————
    h

    =

    kx + k - kx

    = k ???
    Yes that's right. And k is a constant so the limit as h -> 0 is still going to be k.
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    Y=kx
    So
    Lim ((k(X+h)-kx)/h)= ((kx+Kh-kx)/h) =k

    You can check the answer by differentiating it normally dy/dx= k
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    so if you have y = 8x then the gradient function is y = 8

    in other words a constant gradient, which means it is a straight line graph.
 
 
 
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