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Math Help - Solve using Newton's Method

  1. #1
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    Solve using Newton's Method

    Marcus Tool and Die Company produces a specialized milling tool designed specifically for machining ceramic components. Each milling tool sells for $4, so the company's revenue in dollars for x units sold is R(x) = 4x. The company's cost in dollars to produce x tools can be modeled as C(x) = 304+30x^(5/8). Use Newton's method to find the break-even point for the company (that is, find x such that C(x) = R(x)). Use x = 370 as your initial guess and show all your work. Thank you!

    If this turns out to be an elaborate multi-step problem, please let me know so that I can compensate you for your time via PayPal. Again, I appreciate the help.
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    Re: Solve using Newton's Method

    bump
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  3. #3
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    Re: Solve using Newton's Method

    Set up the equation describing the problem
    C(x)=R(x)

    304+30x^{5/8}=4x

    304+30x^{5/8}-4x=0

    let f(x) be
    f(x)=304+30x^{5/8}-4x

    the derivative of this is
    f'(x)=\frac{150}{8}x^{-3/8}-4

    When your first guess (x1) is 370 the second estimate (x2) will be

    x_2=370-\frac{f(370)}{f'(370)}

    390-\frac{304+30(370)^{5/8}-4(370)}{\frac{150}{8}(370)^{-3/8}-4}

    When you have a second estimate repeat the procedure but replace 390 with your second estimate.
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