Consider the function ƒ: R \ {-3} → R : x → x x + 3 (a) Determine the general expression for ƒ(¹)(x), i.e., the formula of the n-th derivative of ƒ, for n ≥ 1. Prove that this expression is correct. (b) Provide the Taylor series of f about 0 and compute the convergence radius. You do not have to examine the convergence of the remainder.

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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3. Consider the function
f: R\ {-3} → R: x→
X
x + 3
(a) Determine the general expression for f(n) (x), i.e., the formula of the n-th derivative
of f, for n ≥ 1. Prove that this expression is correct.
(b) Provide the Taylor series of f about 0 and compute the convergence radius. You do
not have to examine the convergence of the remainder.
(c) Approximate f(0.5) using a Taylor approximation of f of order 3.
(d) Use Taylor's mean value theorem to show that the maximum error on the approxi-
mation made in (c) is less than 0.0008. Explain clearly.
(e) Sketch the graph of f. For this, determine: the intersections points with the axes,
the local extrema, the intervals over which the function is increasing/decreasing, the
intervals over which the function is convex/concave, and all asymptotes.
Transcribed Image Text:3. Consider the function f: R\ {-3} → R: x→ X x + 3 (a) Determine the general expression for f(n) (x), i.e., the formula of the n-th derivative of f, for n ≥ 1. Prove that this expression is correct. (b) Provide the Taylor series of f about 0 and compute the convergence radius. You do not have to examine the convergence of the remainder. (c) Approximate f(0.5) using a Taylor approximation of f of order 3. (d) Use Taylor's mean value theorem to show that the maximum error on the approxi- mation made in (c) is less than 0.0008. Explain clearly. (e) Sketch the graph of f. For this, determine: the intersections points with the axes, the local extrema, the intervals over which the function is increasing/decreasing, the intervals over which the function is convex/concave, and all asymptotes.
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