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    Polynomial Interpolation Question

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    16. Let P_2(x) be the quadratic polynomial interpolating f(x) at the evenly space point x_0, x_1 = x_0 + h, x_2 = x_0 + 2h. Derive formulas for the error:

    f'(x_i) - P'_2(x_i), i = not zero, 1, 2

    Assume f(x) is three times continuously differentiable, give commutable bounds for these errors.

    Hint: use the error formula

    f(t) - P_n(t) = (t - x_0) ... (t - x_n)f[x_0, ..., X_n, t]

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    https://brainmass.com/math/basic-algebra/polynomial-interpolation-question-21604

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