2x Given f(x)= x? +1' XER. Prove from definition, that (--0, –1), (1, +∞) the function f is decreasing in intervals function f is decreasing if f(x)> X1, X2 E D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
2х
Given f(x)=
x² +1°
XER.
Prove from definition, that
(-0, -1), (1, +)
the function f is decreasing
in intervals
function f is decreasing
if
A
X1, x2 E D
→ f(x) > f(%)
Transcribed Image Text:2х Given f(x)= x² +1° XER. Prove from definition, that (-0, -1), (1, +) the function f is decreasing in intervals function f is decreasing if A X1, x2 E D → f(x) > f(%)
Expert Solution
Step 1

We have fx=2xx2+1

Now, for any x,y we have:

fx-fy=2xx2+1-2yy2+1=2xy2+1-2yx2+1x2+1y2+1=2xy2+x-yx2-yx2+1y2+1=2xyy-x-1y-xx2+1y2+1=2xy-1y-xx2+1y2+1

So, we get fx-fy=2xy-1y-xx2+1y2+1

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