Suppose you are given a formula for a function f. (a) How do you determine where f is increasing or decreasing? If f '(x)  ? < > = 0 on an interval, then f is increasing on that interval. If f '(x)  ? < > = 0 on an interval, then f is decreasing on that interval. (b) How do you determine where the graph of f is concave upward or concave downward? If f ''(x)  ? < > = 0 for all x in I, then the graph of f is concave upward on I. If f ''(x)  ? < > = 0 for all x in I, then the graph of f is concave downward on I. (c) How do you locate inflection points? At any value of x where f '(x) = 0, we have an inflection point at (x, f(x)).At any value of x where the concavity does not change, we have an inflection point at (x, f(x)).     At any value of x where the concavity changes, we have an inflection point at (x, f(x)).At any value of x where the function changes from decreasing to increasing, we have an inflection point at (x, f(x)).At any value of x where the function changes from increasing to decreasing, we have an inflection point at (x, f(x)).

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Suppose you are given a formula for a function f.
(a) How do you determine where f is increasing or decreasing?
If
f '(x)  ? < > = 0
on an interval, then f is increasing on that interval.
If
f '(x)  ? < > = 0
on an interval, then f is decreasing on that interval.

(b) How do you determine where the graph of f is concave upward or concave downward?
If
f ''(x)  ? < > = 0
for all x in I, then the graph of f is concave upward on I.
If
f ''(x)  ? < > = 0
for all x in I, then the graph of f is concave downward on I.

(c) How do you locate inflection points?
At any value of x where f '(x) = 0, we have an inflection point at (x, f(x)).At any value of x where the concavity does not change, we have an inflection point at (x, f(x)).     At any value of x where the concavity changes, we have an inflection point at (x, f(x)).At any value of x where the function changes from decreasing to increasing, we have an inflection point at (x, f(x)).At any value of x where the function changes from increasing to decreasing, we have an inflection point at (x, f(x)).
 
 

 

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