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Grade 12Integral Calculus

Stuck in the attached queston is there anyone who can solve this........?

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Profile image of Dheeraj
8 Years agoGrade 12
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2 Answers

Profile image of Arun
8 Years ago
Dear Dheeraj
 
On differentiation
Y' = (x+1)³ * e^x
Now
Y' >0
Hence
(x+1)³ * e^x >0
e^x is always positive
 
Hence
x+1 >0
x> -1
For strictly increasing x > -1
For increasing x >= -1
Profile image of Dheeraj
8 Years ago
You didn`t read question properly it is saying in which interval on R the function is "DECREASING" and u are saying that it is strictly increasing.