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Math Help - Δy

  1. #1
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    Δy

    Compute Δy and dy for x = 4 and dx = Δx = 1.

    so i have found that dy = 1/4

    and I know that Δy=f(x+Δx)-f(x)
    and because x and Δx are given, we have
    f(4+1)-f(4) = f(5)-f(4) right?
    where do i go from here?
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  2. #2
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    What's f? dy=f^\prime(x)dx.
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  3. #3
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    what?
    i don't know.
    I have supplied all of the given information from the original problem
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  4. #4
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    and i already figured out what dy is. i need help with change in y...
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  5. #5
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    You need the derivative to find dy. You sure it wasn't given?
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  6. #6
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    How did you find dy?
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  7. #7
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    Quote Originally Posted by vjelmy View Post
    Compute Δy and dy for x = 4 and dx = Δx = 1.

    so i have found that dy = 1/4

    and I know that Δy=f(x+Δx)-f(x)
    and because x and Δx are given, we have
    f(4+1)-f(4) = f(5)-f(4) right?
    where do i go from here?
    If the problem does not tell you what f(x) is, there is nothing else you can do! And if the problem does not tell you what f(x) is, how in the world did you determine that dy= 1/4?
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