u'v- u Use Quotient Rule to find f'(r). My version of Quotient Rule is So we have u3 and 1+ f'(z) = 2x(1+e*) - x2(e*) _ 2x +2xe* - x2e# | (1e)2 f(r)= + (1 e)? Use Quotient Rule again to find f"(x). For the derivative of the last two terms in the numerator, we will use Product Rule (since it's a product). My version of Product Rule is (uv = u'v+ uv'. So we have f(r) (1e)2 2+(2e +2.xe#) - (2.xe# + x?e#)](1 + e#)? - (2x+ 2xe# = x?e#) |2(1 + e#)(e#)] (1 e)4 1+ e#) - 2e (2.x + 2xe" - x?e") " (2 2e- (1 e)3 2 2e 2 2e2 (1)3 - e# +2e2r _ 4xe2* + x2e2 (1+e")3 2 4e 4

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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This is solving the 2nd derivative of f(x) = x^2/ 1+e^x, and we have already obtained the 1st derivative which is

f'(x) = (2x + 2e^(x) x - x^2 e^x) / (1 + e^x)^2

on the screenshot provided I don't understand how the derivative of 2xe^x works, this confuses me.

u'v- u
Use Quotient Rule to find f'(r). My version of Quotient Rule is
So we have
u3 and 1+ f'(z) = 2x(1+e*) - x2(e*) _ 2x +2xe* - x2e# |
(1e)2
f(r)= +
(1 e)?
Use Quotient Rule again to find f"(x). For the derivative of the last two
terms in the numerator, we will use Product Rule (since it's a product). My
version of Product Rule is (uv = u'v+ uv'. So we have
f(r)
(1e)2
2+(2e +2.xe#) - (2.xe# + x?e#)](1 + e#)? - (2x+ 2xe# = x?e#) |2(1 + e#)(e#)]
(1 e)4
1+ e#) - 2e (2.x + 2xe" - x?e")
"
(2 2e-
(1 e)3
2 2e 2 2e2
(1)3
- e# +2e2r _ 4xe2* + x2e2
(1+e")3
2 4e
4
Transcribed Image Text:u'v- u Use Quotient Rule to find f'(r). My version of Quotient Rule is So we have u3 and 1+ f'(z) = 2x(1+e*) - x2(e*) _ 2x +2xe* - x2e# | (1e)2 f(r)= + (1 e)? Use Quotient Rule again to find f"(x). For the derivative of the last two terms in the numerator, we will use Product Rule (since it's a product). My version of Product Rule is (uv = u'v+ uv'. So we have f(r) (1e)2 2+(2e +2.xe#) - (2.xe# + x?e#)](1 + e#)? - (2x+ 2xe# = x?e#) |2(1 + e#)(e#)] (1 e)4 1+ e#) - 2e (2.x + 2xe" - x?e") " (2 2e- (1 e)3 2 2e 2 2e2 (1)3 - e# +2e2r _ 4xe2* + x2e2 (1+e")3 2 4e 4
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