Results 1 to 10 of 10

Thread: + Rep to whoever can help me figure some calculus out

  1. #1
    Banned


    Join Date
    Jun 2013
    Gender
    Posts
    1,381
    Thanks
    1,025
    Thanked 1,173 Times in 542 Posts


    Downloads
    50
    Uploads
    0
    Mentioned
    257 Post(s)
    Time Online
    104 d 6 h 37 m
    Avg. Time Online
    1 h 30 m
    Rep Power
    0

    + Rep to whoever can help me figure some calculus out

    Closed
    Last edited by learningtoneopet1; 11-22-2013 at 12:01 AM.

  2. #2

    Skarl's Avatar
    Join Date
    Oct 2013
    Gender
    Posts
    1,933
    Thanks
    1,419
    Thanked 1,185 Times in 771 Posts


    Downloads
    20
    Uploads
    0
    Mentioned
    415 Post(s)
    Time Online
    30 d 7 h 36 m
    Avg. Time Online
    28 m
    Rep Power
    7
    Quote Originally Posted by learningtoneopet1 View Post
    if you know how to do curve sketching
    Is this when asymptotes come back with a vengeance? I want to help you, but it's been 10 years for me. I don't think I could produce in 30 minutes.

  3. #3
    Banned


    Join Date
    Jun 2013
    Gender
    Posts
    1,381
    Thanks
    1,025
    Thanked 1,173 Times in 542 Posts


    Downloads
    50
    Uploads
    0
    Mentioned
    257 Post(s)
    Time Online
    104 d 6 h 37 m
    Avg. Time Online
    1 h 30 m
    Rep Power
    0
    Quote Originally Posted by Skarl View Post
    Is this when asymptotes come back with a vengeance? I want to help you, but it's been 10 years for me. I don't think I could produce in 30 minutes.
    Not on these specific types of problems I'm working on It's where you are given one of the following: The graph of f(x), the graph of f'(x), or the graph of f''(x). They don't give you any function whatsoever, and you just have to use the graph they give you to estimate what the other two look like. I know how to do it when I start with the f(x) graph, but if I'm given the other ones, I have no clue cause there's a few rules which dictate how you should draw the graph, which I don't know.

  4. #4

    Skarl's Avatar
    Join Date
    Oct 2013
    Gender
    Posts
    1,933
    Thanks
    1,419
    Thanked 1,185 Times in 771 Posts


    Downloads
    20
    Uploads
    0
    Mentioned
    415 Post(s)
    Time Online
    30 d 7 h 36 m
    Avg. Time Online
    28 m
    Rep Power
    7
    Quote Originally Posted by learningtoneopet1 View Post
    Not on these specific types of problems I'm working on It's where you are given one of the following: The graph of f(x), the graph of f'(x), or the graph of f''(x). They don't give you any function whatsoever, and you just have to use the graph they give you to estimate what the other two look like. I know how to do it when I start with the f(x) graph, but if I'm given the other ones, I have no clue cause there's a few rules which dictate how you should draw the graph, which I don't know.
    f' being the inverse? No idea about f". Don't you swap X and Y for the inverse and that's it?

  5. #5
    Banned


    Join Date
    Jun 2013
    Gender
    Posts
    1,381
    Thanks
    1,025
    Thanked 1,173 Times in 542 Posts


    Downloads
    50
    Uploads
    0
    Mentioned
    257 Post(s)
    Time Online
    104 d 6 h 37 m
    Avg. Time Online
    1 h 30 m
    Rep Power
    0
    Quote Originally Posted by Skarl View Post
    f' being the inverse? No idea about f". Don't you swap X and Y for the inverse and that's it?
    Nah, f' is the derivative of function f. And f'' is the second derivative of function f. So unfortunately, swapping doesn't work out on these .

  6. #6

    Skarl's Avatar
    Join Date
    Oct 2013
    Gender
    Posts
    1,933
    Thanks
    1,419
    Thanked 1,185 Times in 771 Posts


    Downloads
    20
    Uploads
    0
    Mentioned
    415 Post(s)
    Time Online
    30 d 7 h 36 m
    Avg. Time Online
    28 m
    Rep Power
    7
    Quote Originally Posted by learningtoneopet1 View Post
    Nah, f' is the derivative of function f. And f'' is the second derivative of function f. So unfortunately, swapping doesn't work out on these .
    Yeah I don't remember any of that. Sorry. I hope ya find help though! I kinda remember enjoying calculus.

  7. #7
    Banned


    Join Date
    Jun 2013
    Gender
    Posts
    1,381
    Thanks
    1,025
    Thanked 1,173 Times in 542 Posts


    Downloads
    50
    Uploads
    0
    Mentioned
    257 Post(s)
    Time Online
    104 d 6 h 37 m
    Avg. Time Online
    1 h 30 m
    Rep Power
    0
    These are the rules that I found on a website which would help in sketching the functions, but I really don't know how to do that.... For example, if you had the graph of the function f''(x) = 2, you would have to analyze it using those rules to go backwards and find out that f'(x) = 2x and f(x) = x^2

    1. If the first derivative f' is positive (+) , then the function f is increasing ($ \uparrow $) .
    2. If the first derivative f' is negative (-) , then the function f is decreasing ( $ \downarrow $) .

    3. If the second derivative f'' is positive (+) , then the function f is concave up ($ \cup $) .

    4. If the second derivative f'' is negative (-) , then the function f is concave down ($ \cap $) .

    5. The point x=a determines a relative maximum for function f if f is continuous at x=a , and the first derivative f' is positive (+) for x<a and negative (-) for x>a . The point x=a determines an absolute maximum for function f if it corresponds to the largest y-value in the range of f .

    6. The point x=a determines a relative minimum for function f if f is continuous at x=a , and the first derivative f' is negative (-) for x<a and positive (+) for x>a . The point x=a determines an absolute minimum for function f if it corresponds to the smallest y-value in the range of f .

    7. The point x=a determines an inflection point for function f if f is continuous at x=a , and the second derivative f'' is negative (-) for x<a and positive (+) for x>a , or if f'' is positive (+) for x<a and negative (-) for x>a .

    ---------- Post added at 11:30 PM ---------- Previous post was at 11:28 PM ----------

    Quote Originally Posted by Skarl View Post
    Yeah I don't remember any of that. Sorry. I hope ya find help though! I kinda remember enjoying calculus.
    Thanks! And the 30 min mark isn't the limit, just would prefer to have it done by then can really push it off for another 30 mins max

    Edit: If I need to explain anything about what I have to do in more detail, feel free to tell my anyone I'm not super good at explaining
    Last edited by learningtoneopet1; 11-21-2013 at 11:33 PM.

  8. #8

    Skarl's Avatar
    Join Date
    Oct 2013
    Gender
    Posts
    1,933
    Thanks
    1,419
    Thanked 1,185 Times in 771 Posts


    Downloads
    20
    Uploads
    0
    Mentioned
    415 Post(s)
    Time Online
    30 d 7 h 36 m
    Avg. Time Online
    28 m
    Rep Power
    7
    Your multi-step process makes me think that you need to plot it on a line graph to help determine the direction?

    Do you do a table for your 2X and X^2 stuff?

    ---------- Post added at 11:59 PM ---------- Previous post was at 11:58 PM ----------

    Oh and I realize I'm grasping at straws. Really wish I recalled this stuff.

  9. #9
    Banned


    Join Date
    Jun 2013
    Gender
    Posts
    1,381
    Thanks
    1,025
    Thanked 1,173 Times in 542 Posts


    Downloads
    50
    Uploads
    0
    Mentioned
    257 Post(s)
    Time Online
    104 d 6 h 37 m
    Avg. Time Online
    1 h 30 m
    Rep Power
    0
    Quote Originally Posted by Skarl View Post
    Your multi-step process makes me think that you need to plot it on a line graph to help determine the direction?

    Do you do a table for your 2X and X^2 stuff?

    ---------- Post added at 11:59 PM ---------- Previous post was at 11:58 PM ----------

    Oh and I realize I'm grasping at straws. Really wish I recalled this stuff.
    Yeah that's kind of what I have to do I think... I don't know though anyways, mods, this can be closed now. Going to just try and ask someone tomorrow XD.

  10. #10
    shos's Avatar
    Join Date
    Jun 2013
    Gender
    Location
    Middle East
    Posts
    118
    Thanks
    43
    Thanked 9 Times in 8 Posts


    Downloads
    21
    Uploads
    0
    Mentioned
    11 Post(s)
    Time Online
    2 d 11 h 30 m
    Avg. Time Online
    2 m
    Rep Power
    5
    if anyone needs any more calculus/math/physics help, pm me guys

  11. The Following 2 Users Say Thank You to shos For This Useful Post:

    learningtoneopet1 (11-22-2013),Skarl (11-22-2013)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •