(d) Using Part (c) and continuity of g, prove that g(x) = mx + l for some m, l 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.

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter3: Functions
Section3.3: More On Functions; Piecewise-defined Functions
Problem 99E: Determine if the statemment is true or false. If the statement is false, then correct it and make it...
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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(a — 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:
= m
2"
+ l, for any integers p and n > 0.
2n
g
Hint. Define l = g(0), and m =
g(1) – g(0).
(d) Using Part (c) and continuity of g, prove that g(x)
= mx + l for some m, l e R.
(e) Using Equation (1) and Part (d), prove that there exist a, b, c e R such that f(x) =
ax² + bx + c.
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(a — 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: = m 2" + l, for any integers p and n > 0. 2n g Hint. Define l = g(0), and m = g(1) – g(0). (d) Using Part (c) and continuity of g, prove that g(x) = mx + l for some m, l e R. (e) Using Equation (1) and Part (d), prove that there exist a, b, c e R such that f(x) = ax² + bx + c.
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