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Math Help - Using 'nDeriv' on a TI-84 Plus

  1. #1
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    Using 'nDeriv' on a TI-84 Plus

    On my TI-84 Plus graphics calc, I've found there's a function called nDeriv, that can be used to find a derivative. It sounds useful, so how do I use it?
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Naur View Post
    On my TI-84 Plus graphics calc, I've found there's a function called nDeriv, that can be used to find a derivative. It sounds useful, so how do I use it?
    There may be other uses for this, but I know that it can compute the value of a derivative at a given x value.

    So, for example, nDeriv(x^2+4x-3,x,2) will compute the derivative of x^2+4x-3 at x=2.

    Others may want to add on to this. Also, why don't you look at the owner's manual for some more info?

    --Chris
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    I'm not sure where my manual is.
    Why do you have to choose an x value? For example, the derivative of 2x = 2. How would you do that on a calculator?
    It seems almost useless if you can only use it for a single point.

    For example, the where I found out about it, I was reading the answer of a question. I had to sketch the derivative, and it said to use nDeriv in the calculator. But it seems it wouldn't help you sketch a graph, aside from delivering the derivative at certain points on the derivative function.
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  4. #4
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    Quote Originally Posted by Naur View Post
    I'm not sure where my manual is.
    Why do you have to choose an x value? For example, the derivative of 2x = 2. How would you do that on a calculator?
    It seems almost useless if you can only use it for a single point.

    For example, the where I found out about it, I was reading the answer of a question. I had to sketch the derivative, and it said to use nDeriv in the calculator. But it seems it wouldn't help you sketch a graph, aside from delivering the derivative at certain points on the derivative function.
    I've attached a screenshot to show you how to use nDeriv( with a TI84.

    The TI84 calculates the value of the slope by iteration at a given x-value.
    Attached Thumbnails Attached Thumbnails Using 'nDeriv' on a TI-84 Plus-nderiv_ti84.png  
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  5. #5
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    Go to Y=

    Type in the function in Y1

    Type in Y2: nDeriv(Y1,X,X)
    *Y1 is found under "Vars" key under "Function"

    It should draw the graph of the derivative.
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  6. #6
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    I had a practise exam, I used this quite a few times, even just finding the derivative at a certain point. Thanks.
    Oh...so if I make the second value 'x', it will draw it...
    Works perfectly, thanks very much
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