Find the derivative of the following using the three-step rule Зх-1 1. у3D 2x+5 2. y=Va² +x²

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter3: The Derivative
Section3.CR: Chapter 3 Review
Problem 59CR
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Please answer the no.2 only. You have to solve like sample picture:

 

Find the derivative of the following using the three-step rule
Зx-1
1. у3
2x+5
2. y=Va² +x?
Transcribed Image Text:Find the derivative of the following using the three-step rule Зx-1 1. у3 2x+5 2. y=Va² +x?
-3-1
EXAMPLE 3.1.2 Find the derivative of y = x3. Using the formula, y' = -3x
-3x-4.
Here is the general computation. Suppose n is a negative integer; the algebra is easier
to follow if we use n = -m in the computation, where m is a positive integer.
d
d
-m
(л + Дл) -т —
= lim
Ar→0
dx
dx
Ax
1
1.
(r+Ax)m
lim
Ar→0
Ax
2т — (х + Дх)т
= lim
Ar→0 (x + Ax)mxm Ax
m
-
xm – (xm + mxm-1Ax + a2x"-2Ax² + . .
(x + Ax)mxmAx
+ am-1xAx™-1 + Aæ™)
...
lim
Ar→0
-mxm-
a2xm-2Ax
am-1xAx™-2 – Aa™-1)
...
lim
Ar-0
(x+ Ax)mxm
-mx
m-1
-mxm-1
= -mx'
,т-1-2т
= nx
-m-1
nx"-1
xm xm
x2m
Transcribed Image Text:-3-1 EXAMPLE 3.1.2 Find the derivative of y = x3. Using the formula, y' = -3x -3x-4. Here is the general computation. Suppose n is a negative integer; the algebra is easier to follow if we use n = -m in the computation, where m is a positive integer. d d -m (л + Дл) -т — = lim Ar→0 dx dx Ax 1 1. (r+Ax)m lim Ar→0 Ax 2т — (х + Дх)т = lim Ar→0 (x + Ax)mxm Ax m - xm – (xm + mxm-1Ax + a2x"-2Ax² + . . (x + Ax)mxmAx + am-1xAx™-1 + Aæ™) ... lim Ar→0 -mxm- a2xm-2Ax am-1xAx™-2 – Aa™-1) ... lim Ar-0 (x+ Ax)mxm -mx m-1 -mxm-1 = -mx' ,т-1-2т = nx -m-1 nx"-1 xm xm x2m
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