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taylor's theor
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TAYLOR EXPANSION
Taylor's theorem states that a poly-
nomial of degree N can be expressed as
a polynomial of degree N in powers of
(X-A) where A is any constant.
Theorem: For any polynomial F of
degree N and any constant A,
2
1) F(X) = A + A (X-A) + A (X-A) +..
0 1 2
N
... +A (X-A)
N
1 (I)
where A =---- F (A).
I I!
(That is, A is the Ith derivative of
I
F at A divided by I factorial).
4 3 2
Problem: Expand 3X +X -5X +X-10 in
powers of X-1.
Solution: Use the LOADSTAR Polynomial
Division program to compute the
following sequence of divisions, each
time dividing the quotient obtained by
X-1 for the next step.
4 3 2 3 2
3X +X -5X +X-10 / X-1; Q=3X +4X -X
R=-10
3 2 2
3X +4X -X / X-1 ; Q=3X +7X+6
R=6
2
3X +7X+6 / X-1 ; Q=3X +10
R=16
3X+10 / X-1 ; Q=3
R=13
3 / X-1 ; Q=0
R=3
where Q is the quotient and R is the
remainder for each division.
Now construct the desired polynomial
by using the remainders in reverse
sequence as the coefficients.
4 3 2
3(X-1) +13(X-1) +16(X-1) +6(x-1)-10
Note that we computed this form of the
original polynomial without ever
calculating a derivative!
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