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March 26, 2017

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Suppose that you can calculate the derivative of a function using the formula f'(x) = 4f(x) + 2x. If the output value of the function at x= 4 is 2 estimate the value of the function at 4.013

  • calculus 2 - ,

    I would estimate it using the first two terms of a McLaurin series expansion:
    f(4.013) = f(4) + (4.013-4) f'(x)
    = f(4) + 0.013 f'(4)
    where f(4) = 2, and
    f'(4) = 4f(4) + 2*4 = 16

    So, f(4.013) = 2 + 0.013*16 = 2.208

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