SK YOUR TEACHER PRACTICE ANOTHER Prove the statement using the , definiton of a lmt. lim -2x - 8 X-4 Given e> 0, we need &0 2- 2x -8 v Such that O 4 then -6 We have *-4 x2- 2x -8 -4 21 - e 2-6e - O *-4 x-4 8- Selectv Then 0 -4<6- I-4«dete - t definition of a limit, im 2-86. Reed Need Help? Vieing Saved Work evetoLast esona Submit Answer

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter10: Inequalities
Section10.4: Solving Combined Inequalities
Problem 39WE
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Question

Prove the statement using the ?, ? definition of a limit.

lim x→4 
x2 − 2x − 8
x − 4
 = 6

Given

? > 0,

we need

?
 

such that if

0 < |x − 4| <
,

then

 
x2 − 2x − 8
x − 4
 − 6
 
 
.

We have

 
x2 − 2x − 8
x − 4
 − 6
 
 < ?   ⇔   
 
(x − 4)(x + 2)
x − 4
 − 6
 
 < ?   ⇔   |x + 2 − 6| < ?  [x ≠ 4]   ⇔   |x − 4| < ?.

Choose

? =
.

Then

0 < |x − 4| < ?   ⇒   |x − 4| <

  ⇒   

 
x2 − 2x − 8
x − 4

 − 6

 

 

By the definition of a limit,
lim x→4 
x2 − 2x − 8
x − 4
 = 6.
 
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NOTES
ASK YOUR TEACHER
PRACTICE ANOTHER
Prove the statement using the e, definition of a lmt.
-2 - ৪
lim
4
X-4
Given e> o, we need & >0
x2- 2x -8
x- 4
x2-2x-8
x - 4
v Such that O-4
then
We have
-6 <EO
E 2-6e
-See
-Select v
. Then 0< x-4 <6 -4 -deled
definition of a limit, im 2x-8
X-4
vach
Reed
Need Help?
Veing Saved Work eetasteson
Submit Answer
Transcribed Image Text:NOTES ASK YOUR TEACHER PRACTICE ANOTHER Prove the statement using the e, definition of a lmt. -2 - ৪ lim 4 X-4 Given e> o, we need & >0 x2- 2x -8 x- 4 x2-2x-8 x - 4 v Such that O-4 then We have -6 <EO E 2-6e -See -Select v . Then 0< x-4 <6 -4 -deled definition of a limit, im 2x-8 X-4 vach Reed Need Help? Veing Saved Work eetasteson Submit Answer
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