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
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
Related questions
Question
Prove the statement using the ?, ? definition of a limit.
lim x→4
= 6
x2 − 2x − 8 |
x − 4 |
Given
? > 0,
we need
?
such that if
0 < |x − 4| <
,
then
x2 − 2x − 8 |
x − 4 |
.
We have
x2 − 2x − 8 |
x − 4 |
(x − 4)(x + 2) |
x − 4 |
Choose
? =
.
Then
0 < |x − 4| < ? ⇒ |x − 4| <
⇒
x2 − 2x − 8 |
x − 4 |
− 6
By the definition of a limit,
lim x→4
= 6.
x2 − 2x − 8 |
x − 4 |
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