Write down the Lagrange form of the interpolating polynomial P(x) that satisfies P(x) = f(x) for x = = 1,...,n and x1 < x2 < · · · < xn• (1) Find the form of the polynomial that interpolates f(x) = 1 through the points x = x1 = 0.5, x2 = 1 and x3 = 3, then simplify it. Use this polynomial to estimate the value of ƒ (2) and find the error from the actual value.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.3: Zeros Of Polynomials
Problem 65E
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Write down the Lagrange form of the interpolating polynomial P(x) that satisfies
P(x) = f(x) for x =
=
1, ...,
n and x1 < x2 < · · ·
< xn⋅
(1)
Find the form of the polynomial that interpolates f(x) = 1½ through the points
x₁ = 0.5, x2 = 1 and x3 3, then simplify it. Use this polynomial to estimate the
value of ƒ (2) and find the error from the actual value.
=
Using the error formula for Lagrange interpolation,
n
f(x) = P(x) +
-
(2 – x)
dn f
dxn
(§), for some ε € (x1,xn),
(2)
i=1
find upper and lower bounds for the error in your estimate above. How does this
compare with the actual error?
Transcribed Image Text:Write down the Lagrange form of the interpolating polynomial P(x) that satisfies P(x) = f(x) for x = = 1, ..., n and x1 < x2 < · · · < xn⋅ (1) Find the form of the polynomial that interpolates f(x) = 1½ through the points x₁ = 0.5, x2 = 1 and x3 3, then simplify it. Use this polynomial to estimate the value of ƒ (2) and find the error from the actual value. = Using the error formula for Lagrange interpolation, n f(x) = P(x) + - (2 – x) dn f dxn (§), for some ε € (x1,xn), (2) i=1 find upper and lower bounds for the error in your estimate above. How does this compare with the actual error?
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