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Math Help - For the function (x) = x^3 - 8x + 3, calculate

  1. #1
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    For the function (x) = x^3 - 8x + 3, calculate

    (f(a+h)-f(a))/h where a = 5 and h = 1
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  2. #2
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    Quote Originally Posted by ilovemymath View Post
    (f(a+h)-f(a))/h where a = 5 and h = 1
    Looks straight forward to me.

    \frac{((5+1)^2-8(5+1))+3-((5)^2-8(5)+3)}{1}
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  3. #3
    Member mfetch22's Avatar
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    Quote Originally Posted by ilovemymath View Post
    (f(a+h)-f(a))/h where a = 5 and h = 1
    Was this all the question asked? It seems to simple. Did the question by chance ask to calculate:

    \lim_{h \to 1} \frac{f(a+h)-f(a)}{h}

    with a = 5

    ??

    Or did it indeed ask exactly as you had said, to simply calculate the value of the function?

    (I know, this may seem like an unneccesary post, but I am just trying to make sure it wasn't the limit that they were asking you to calculate, since something of the form:

    \frac{f(a+h)-f(a)}{h}

    is used in problems with limits very, very, very often. And since this question is in the calculus thread area.)
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  4. #4
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    with a cube instead of a square,
    typo by "picks"
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