Suppose that f has continuous derivative and is twice differentiable in R. Suppose that f(a) = f(b) = 0. Show that for every x E (a,b), there is § E (a,b) such that f"(€) (æ – a)(x – b). f(x) = 2

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.5: The Kernel And Range Of A Linear Transformation
Problem 30EQ
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Suppose that f has continuous derivative and is twice differentiable in R. Suppose that f(a) = f(b) =
= 0. Show
that for every x E (a, b), there is E (a, b) such that
f"(£),
(x – a) (x – 6).
f(æ) =
2
Hint: let k = f(x)/(x – a)(x – b); consider the function F(t) = f(t) – k(x – a)(x – b) and use the first
exercise.
Transcribed Image Text:Suppose that f has continuous derivative and is twice differentiable in R. Suppose that f(a) = f(b) = = 0. Show that for every x E (a, b), there is E (a, b) such that f"(£), (x – a) (x – 6). f(æ) = 2 Hint: let k = f(x)/(x – a)(x – b); consider the function F(t) = f(t) – k(x – a)(x – b) and use the first exercise.
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