In the fucntion:  f(x)= (12-3x)(e^x)  When is the function concave up and concave down in interval notation?  What are the x-values of all inflection points?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section: Chapter Questions
Problem 10SGR
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In the fucntion: 

f(x)= (12-3x)(e^x) 

When is the function concave up and concave down in interval notation? 

What are the x-values of all inflection points? 

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