Find the intervals of concavity for the function f(x) = e-13. Identify any inflection points.

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
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ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter8: Graphing Quadratic Functions
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4. Find the intervals of concavity for the function f(x) = e-/3. Identify any inflection points.
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Transcribed Image Text:4. Find the intervals of concavity for the function f(x) = e-/3. Identify any inflection points. 10 PAGES
Expert Solution
Step 1

Given function is

f(x)=e-x33

Differentiate f(x) with respect to x twice.

f'(x)=e-x33ddx-x33=-x2e-x33f''(x)=-x2ddxe-x33+e-x33ddx(-x2)f''(x)=x4e-x33-2xe-x33f''(x)=x(x3-2)e-x33

Now,

f''(x)=0x(x3-2)e-x33=0x=0,213

 

Step 2

Now, consider the points -1 , 1,2 in intervals -,0,0,213,213,

f''(-1)=-1(-1-2)e13>0f''(1)=1(1-2)e13<0f''(2)=2(8-2)e13>0

Thus, f(x) is concave in interval -,0213, and concave down in interval 0,213

Points of inflection are 0 and 213

 

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