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Thread: Finding interval for regula falsi method for equation "x - e^-x"

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    Finding interval for regula falsi method for equation "x - e^-x"

    What could be the best interval with regula falsi method for equation "x - e^-x" from attached graph ?
    Can anyone help ?
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  2. #2
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    Pick one on each side. Do we need more care than that?
    "Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.

  3. #3
    Quote Originally Posted by tkhunny View Post
    Pick one on each side. Do we need more care than that?
    I picked (-4, 4), (-4, 2), (-1, 1), (-1, 2)
    but it doesn't gives solution.

    Actually here minimum iterations are required to find root. This is what to care about.

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    Elite Member stapel's Avatar
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    Cool

    Quote Originally Posted by mymath007 View Post
    What could be the best interval with regula falsi method for equation "x - e^-x"...?
    The quoted portion is just an expression. Is the "function" meant to be "f(x) = x - e-x"? And you're trying to find the x-intercept numerically? I think that's what is indicated in the graph....

    What do you mean by "the best interval"? Are you given a list of answer-options, and you're expected to pick the best one of those listed? (I mean, any interval that eventually iterates to a solution is a "good" interval, right?)

    Quote Originally Posted by mymath007 View Post
    I picked (-4, 4), (-4, 2), (-1, 1), (-1, 2) but it doesn't gives solution.
    What do you mean by "it"? You seem to have "picked" four intervals, rather than one. What did you do with these? On what basis have you determined that "it" ("they"?) fail(s) to lead to the solution?

    Quote Originally Posted by mymath007 View Post
    Actually here minimum iterations are required to find root. This is what to care about.
    I'm sorry, but I don't know what this means...? Please reply with clarification, along with a clear listing of your steps and results so far. Thank you!

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    Quote Originally Posted by mymath007 View Post
    I picked (-4, 4), (-4, 2), (-1, 1), (-1, 2)
    but it doesn't gives solution.

    Actually here minimum iterations are required to find root. This is what to care about.
    They all give a solution. Please show your work with just ONE of the intervals.
    "Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.

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