The given function  y = 9x3e−x  is of the form  y = uv,  where  u = 9x3  and  v =  e−x       . Use the Product Rule,   d dx(uv) = u dv dx + v du dx, to differentiate y with respect to x. y '  =  d dx  9x3e−x     y '  =  9x3  −e−x   +  x         e−x     y '  =  9x2e−x    0

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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The given function 
y = 9x3e−x
 is of the form 
y = uv,
 where 
u = 9x3
 and 
v = 
e−x
 
 
  .
Use the Product Rule,
 
d
dx
(uv) = u
dv
dx
 + v
du
dx
,
to differentiate y with respect to x.
y '  = 
d
dx
 
9x3e−x
 
 
y '  =  9x3
 
−e−x
 
 + 
x
 
 
  
 
e−x
 
 
y '  =  9x2e−x
 
 
0
 
 
  
 
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