Find the Taylor series expansion (that is, infinite-order approxima-tion) of the function f (x) = ex2 around the point x = 2, and use it toobtain a cubic approximation of this function. What is the Lagrangeform of the remainder term that reconciles the cubic approximationof the function based on its Taylor series expansion and the true valueof the function?
Question
Find the Taylor series expansion (that is, infinite-order approxima-tion) of the function f (x) = ex2 around the point x = 2, and use it toobtain a cubic approximation of this function. What is the Lagrangeform of the remainder term that reconciles the cubic approximationof the function based on its Taylor series expansion and the true valueof the function?
Solution
The Taylor series expansion of a function f(x) around a point a is given by:
f(x) = f(a) + f'(a)(x-a) + f''(a)(x-a)^2/2! + f'''(a)(x-a)^3/3! + ...
where f'(a), f''(a), f'''(a), ... are the first, second, third, ... derivatives of f at the point a.
Given the function f(x) = e^(x^2), we first need to find its derivatives at the point x = 2.
The
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