5. In this problem you will need to use complex number arithmetic. Assume that the equation f(x) = 0 has a unique solution in an interval [a, b], and that f € C³ [a, b]. (a) Let h> 0 be a small number. Using appropriate Taylor expansion show that f'(ro) Im(f(ro+ih))/h + h²f" (ro)/6+0(h¹), = Where i is the imaginary unit such that i2 = -1.

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Please do the following questions with the code required and correct indentations

 
5.
In this problem you will need to use complex number arithmetic. Assume that the
equation f(x) = 0 has a unique solution in an interval [a, b], and that fe C³ [a, b].
(a)
Let h> 0 be a small number. Using appropriate Taylor expansion show that
f'(ro) = Im(f(xo +ih))/h + h²f" (xo)/6+0(hª),
(b)
Where i is the imaginary unit such that i2= -1.
Since f'(ro) Im(f(xo + ih))/h, consider the following modification of Newton's
method with complex
step.
f(xk)
Im(f(xk+ih))
Tk+1=kh-
k = 0, 1, 2,...
with given ro. Modify your code with Newton's method of problem 4 so as the default value
of the derivative df to be the new approximation Im(f(ro+ih))/h.
Assume that
|æk+1=x*|
kx|kx* |r
where 2* is such that f(r*) = 0. This means that the convergence rate of the new method is
r. Estimate the convergence rate r using the equation r(e/2 + 1) = 0 and ro = 2.5. Study
the influence of the parameter h in the convergence rate.
lim
= C > 0,
Transcribed Image Text:5. In this problem you will need to use complex number arithmetic. Assume that the equation f(x) = 0 has a unique solution in an interval [a, b], and that fe C³ [a, b]. (a) Let h> 0 be a small number. Using appropriate Taylor expansion show that f'(ro) = Im(f(xo +ih))/h + h²f" (xo)/6+0(hª), (b) Where i is the imaginary unit such that i2= -1. Since f'(ro) Im(f(xo + ih))/h, consider the following modification of Newton's method with complex step. f(xk) Im(f(xk+ih)) Tk+1=kh- k = 0, 1, 2,... with given ro. Modify your code with Newton's method of problem 4 so as the default value of the derivative df to be the new approximation Im(f(ro+ih))/h. Assume that |æk+1=x*| kx|kx* |r where 2* is such that f(r*) = 0. This means that the convergence rate of the new method is r. Estimate the convergence rate r using the equation r(e/2 + 1) = 0 and ro = 2.5. Study the influence of the parameter h in the convergence rate. lim = C > 0,
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