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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My professor says I have to explain the steps in the solved problems in the picture. Not just copy eveything down from the text.

Transcribed Image Text:Derivatives
3+x
(a) Let f(x) =-
, x + 3. Evaluate f'(2) from the definition.
3 — х
4.1.
f(2 + h) – f(2)
1(5+h
lim
1 6h
- 5 = lim
6
f'(2) = lim
- = lim
6.
h
h→0 h1-h
h→0 h 1-h h→0 1-h
h→0
Note: By using rules of differentiation we find
(3 - x) dx
f'(x) = -
d
(3 + x) – (3 + x):
d
(3— х)
dx
(3 – x) (1) – (3 + x) (-1)
(3— х)2
(3- х)2
(3 — х)?
at all points x where the derivative exists. Putting x= 2, we find f'(2) = 6. Although such rules are often useful,
one must be careful not to apply them indiscriminately (see Problem 4.5).
(b) Let f(x) = /2x – 1. Evaluate f'(5) from the definition.
f'(5) = lim
h→0
f(5+ h) – f(5)
9+2h – 3
lim
h
h→0
h
9+2h - 3
9 +2h +3
9 + 2h – 9
2
1
lim
lim
h→0 h (/9 +2h +3
d
By using rules of differentiation we find f'(x) =
dx
lim
9+2h +3
1
h
9+2h +3
3
h→0
h→0
(2x – 1)/2
- (2x – 1)-1/2 d
(2x – 1) =
dx
2
1
(2x – 1)-1/2. Then f'(5) = 9-1/2 =.
3
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