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Fundamental Methods of Mathematical Economics

Alpha C. Chiang, Kevin Wainwright

Chapter 7

Rules of Differentiation and Their Use in Comparative Statics - all with Video Answers

Educators


Section 1

Rules of Differentiation for a Function of One Variable

01:23

Problem 1

Find the derivative of each of the following functions:
$$(a) y=x^{12}$$
$$(b) y=63$$
$$(c) y=7 x^{5}$$
$$(d) w=3 u^{-1}$$
$$(e) w=-4 u^{1 / 2}$$
$$(f) w=4 u^{1 / 4}$$

Andrew Davis
Andrew Davis
Numerade Educator
01:27

Problem 2

Find the following:
$$(a) \frac{d}{d x}\left(-x^{-4}\right)$$
$$(b) \frac{d}{d x} 9 x^{1 / 3}$$
$$(c) \frac{d}{d w} 5 w^{4}$$
$$(d) \frac{d}{d x} c x^{2}$$
$$(e) \frac{d}{d u} a u^{b}$$
$$(f) \frac{d}{d u}-a u^{b}$$

David Collins
David Collins
Numerade Educator
00:54

Problem 3

Find $f^{\prime}(1)$ and $f^{\prime}(2)$ from the following functions:
$$(a) y=f(x)=18 x$$
$$(b) y=f(x)=c x^{3}$$
$$(c) f(x)=-5 x^{-2}$$
$$(d) f(x)=\frac{3}{4} x^{4 / 3}$$
$$(e) f(w)=6 w^{1 / 3}$$
$$(f) f(w)=-3 w^{-1 / 6}$$

Amy Jiang
Amy Jiang
Numerade Educator
00:57

Problem 4

Graph a function $f(x)$ that gives rise to the derivative function $f^{\prime}(x)=0 .$ Then graph a function $g(x)$ characterized by $g^{\prime}\left(x_{0}\right)=0$

Katelyn Chen
Katelyn Chen
Numerade Educator