Use the comparison test to show that lim ootu 6n +n³ 5n - n³

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
Problem 28RE
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Theorem 2.4.7 (Comparison Test) Suppose {an} and {bn} are sequences
such that VnEN, an ≤ bn.
(a) If lim an = +∞o, then lim bn
818
n→∞
=
+∞o.
(b) If lim bn = ∞, then lim an = -0.
n→∞
n→∞
Proof. (a) Suppose lim an = +∞o. Let M > 0. Then, by Definition 2.4.1,
818
no
Nn > no ⇒ an> M. Since VnE N, an ≤ bn, it follows that
n> no ⇒ bn > M. Therefore, lim bn = +∞o.
n18
(b) Exercise 5.
Transcribed Image Text:Theorem 2.4.7 (Comparison Test) Suppose {an} and {bn} are sequences such that VnEN, an ≤ bn. (a) If lim an = +∞o, then lim bn 818 n→∞ = +∞o. (b) If lim bn = ∞, then lim an = -0. n→∞ n→∞ Proof. (a) Suppose lim an = +∞o. Let M > 0. Then, by Definition 2.4.1, 818 no Nn > no ⇒ an> M. Since VnE N, an ≤ bn, it follows that n> no ⇒ bn > M. Therefore, lim bn = +∞o. n18 (b) Exercise 5.
Use the comparison test to show that lim
ootu
6n +n³
5n - n³
Transcribed Image Text:Use the comparison test to show that lim ootu 6n +n³ 5n - n³
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