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Interpolation - Lagrange's Interpolation

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Calculus engineering math, Lagranges Interpolation, Quadratic Interpolation, Interpolating polynomial. See attached file for full problem description.

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For the description of the problem on Interpolation, please see the attached pdf file.
The solution to this given problem is explained in detail step by step in the attached solution file.

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Solution :

Given f(x) = x3 + x - 1 ; and 0 ≤ x ≤ 2

x F(x) F(x0 , x1 ) F(x0 , x1 , x2 ) F(x0 , x1 , x2 , x3 )
0 - 1
½ - 0.375 1.25
1 1 2.75 1.5
3/2 3.875 5.75 3 1
2 9 10.25 4.5 1

The Interpolation formula is

f(x) = f(x0) + (x - x0) f(x0 , x1 ) + (x - x0 )(x - x1 )f (x0 , x1 , x2 ) + ............ .......(1)

(i)

f(1/4) = f(0.25) = - 1 + (0.25 - 0)(1.25) + (0.25 - 0) (0.25 - 0.5) (1.5)
+ (0.25 - 0) (0.25 - 0.5)(0.25 - ...

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