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Thread: My Calculus group work for University - Help Please!

  1. #1

    My Calculus group work for University - Help Please!

    Hello, I've been working on some homework for my Calculus class in university, and we really cant figure out the answers for the last few questions; any help would be greatly appreciated - a step by step with some explanation would be great!

    Each question is worth 10 marks:

    1. Using a result from the module, show that the equation

    P(x)=x3 + sin(x) - 30 = 0

    has solution x* with 3 ≤ x* ≤ 4 .

    A lecturer decides to use the Newton-Raphson method 'xn+1 = g(xn ) to determine x* . Write down and simplify the function g(x) which should be used. Using a calculator (and working to at least 4 decimal places), determine x1 , x2 , x3 , x4 , given that x0 = 3. For the value of x4 which you have found, determine P(x4 ) .

    2. Let

    F(x) = x4 sin (
    π x) , G(x) = 4x - 16 .

    Determine the first and second derivatives of F and G. Determine the Taylor series of F and the Taylor series of G about x = 2, in each case up to and including the term (x - 2)2 . Use your answers to detemine

    x->2 F(x) / G(x) .

    3. Let

    y = H(x) = 8x+5 / 2x-9 .

    Determine the maximal domain of H, a formula for x in terms of y, and the corresponding range of H. Sketch the graph of H showing clearly any horizontal and/or vertical asymptotes and points where the graph meets x and/or y axes.

    4. Determine the Taylor series of h(x) = ln(1 + 2x) about x=0, up to and including the term x3 . Use your answer to determine the following limits:

    L1 = lim x->0+ ln(1 + 2x) / x ,

    L2 = lim y->+
    ∞ y ln(1 + 2 / y) ,

    L3 = lim y->+∞ (1 + 2 / y)y .

    This is my first post on this forum so I'm sorry if everything isn't perfect, and thanks in advance for anyone who takes time to help me out! I'm more than happy to return the favour using my knowledge, thank you!

  2. #2
    Elite Member
    Join Date
    Apr 2005
    One at a time, please, and show your work.

    The first is an existence problem. Who cares exactly WHAT the solution is? We just need to now that it's there.

    Is P(x) continuous? What's P(3) and P(4)?
    "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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