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Math Help - graph with excel

  1. #1
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    graph with excel

    [Excel Exercise]
    (a) Plot the graph of f (x) = 3x + 2x^2-x^3-5 over the interval [0, 3] using 0.2 as a step
    size. From the graph estimate the smaller of the two roots of f (x) = 0 . (This should be
    correct to 1 decimal place.)
    (b) Use the Newton-Raphson method to find an approximation to the smaller positive root
    of f (x) = 0 correct to 7 decimal places.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by tondie2 View Post
    [Excel Exercise]
    (a) Plot the graph of f (x) = 3x + 2x^2-x^3-5 over the interval [0, 3] using 0.2 as a step
    size. From the graph estimate the smaller of the two roots of f (x) = 0 . (This should be
    correct to 1 decimal place.)
    (b) Use the Newton-Raphson method to find an approximation to the smaller positive root
    of f (x) = 0 correct to 7 decimal places.
    see the graph below. it is a close up of the graph where the roots are. that should take care of part (a)

    for part (b), obviously you use the Newton-Raphson method. you can find out how to use it here
    Attached Thumbnails Attached Thumbnails graph with excel-roots.jpg  
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