2 (c) Prove that there exist m, l e R such that for g defined in Part (b) (satisfying Equation (2)) we have: = m · 2n - е, for 2n any integers p and n > 0. Hint. Define l = g(0), and m = 8(1) – 8(0). (d) Using Part (c) and continuity of g, prove that g(x) : 3D тх + l for some m, € E R. (e) Using Equation (1) and Part (d), prove that there exist a, b, c e R such that f(x) ax? + bx + c.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Parts C, D and E

3. Let f: R → R be a differentiable function such that f'(x) is continuous. Assume that f
satsifies for
any x, h e R:
h
f(x + h) – f(x) = hf' (x +
(1)
(a) Prove that for every a e R the function r(x) :=
f (a+x)-f(а-х)
2x
defined everywhere on R
except zero, is constant.
(b) Using Part (a) and Equation (1), prove that the function g(x) = f'(x) satisfies for any
а, х € R:
8 (а + х) + g(а — х)
= g(a).
(2)
(c) Prove that there exist m, l e R such that for g defined in Part (b) (satisfying Equation
(2)) we have:
+ l, for any integers p and n
2n
0.
= m :
2n
Hint. Define l =
g(0), and m =
8(1) – g (0).
(d) Using Part (c) and continuity of g, prove that g(x) = mx + l for some m, ł e R.
(e) Using Equation (1) and Part (d), prove that there exist a, b, c e R such that f(x) =
ах? + bx + с.
Transcribed Image Text:3. Let f: R → R be a differentiable function such that f'(x) is continuous. Assume that f satsifies for any x, h e R: h f(x + h) – f(x) = hf' (x + (1) (a) Prove that for every a e R the function r(x) := f (a+x)-f(а-х) 2x defined everywhere on R except zero, is constant. (b) Using Part (a) and Equation (1), prove that the function g(x) = f'(x) satisfies for any а, х € R: 8 (а + х) + g(а — х) = g(a). (2) (c) Prove that there exist m, l e R such that for g defined in Part (b) (satisfying Equation (2)) we have: + l, for any integers p and n 2n 0. = m : 2n Hint. Define l = g(0), and m = 8(1) – g (0). (d) Using Part (c) and continuity of g, prove that g(x) = mx + l for some m, ł e R. (e) Using Equation (1) and Part (d), prove that there exist a, b, c e R such that f(x) = ах? + bx + с.
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