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Taylor Polynomial Approximations

Taylor Polynomial Approximations. A graphical demonstration. Approximating. Best first order (linear) approximation at x=0 . OZ calls this straight line function P 1 (x). Note: f(0)=P 1 (0) and f’(0)=P’ 1 (0). Approximating. Best second order (quadratic) approximation at x=0 .

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Taylor Polynomial Approximations

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  1. Taylor Polynomial Approximations A graphical demonstration

  2. Approximating • Best first order (linear) approximation at x=0. • OZ calls this straight line function P1(x). • Note: f(0)=P1(0) and f’(0)=P’1(0).

  3. Approximating • Best second order (quadratic) approximation at x=0. • OZ calls this quadratic function P2(x). • Note: f(0)=P2(0), f’(0)=P’2(0), and f’’(0)=P’’2(0).

  4. Approximating • Best third order (cubic) approximation at x=0. • OZ calls this cubic function P3(x). • Note: f(0)=P3(0), f’(0)=P’3(0), f’’(0)=P’’3(0), and f’’’(0)=P’’’3(0), .

  5. Approximating • Best sixth order approximation at x=0. • OZ calls this function P6(x). • P6 “matches” the value of f and its first 6 derivatives at x=0.

  6. Approximating • Best eighth order approximation at x=0. • OZ calls this function P8(x). • P8 “matches” the value of f and its first 8 derivatives at x=0.

  7. Approximating • Best tenth order approximation at x=0. • This is P10(x).

  8. Approximating • Best hundedth order approximation at x=0. • This is P100(x). • Notice that we can’t see any difference between f and P100 on [-3,3].

  9. Approximating • What happens on [-6,6]?

  10. Approximating ---Different “centers” Third order approximation at x=0 Third order approximation at x= -1

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