M In³ + (n + 1)³ > (n + 2)³ GEGECS

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Find the set of natural numbers n for which holds and prove it by induction
d) n³ + (n + 1)³ > (n + 2)³.
Transcribed Image Text:d) n³ + (n + 1)³ > (n + 2)³.
Expert Solution
Step 1

Let p(n) be the statement 'n3+(n+1)3>(n+2)3'.

13+23=9 27=33 23+33=3564=4333+43=91125=5343+53=189216=6353+63=341343=7363+73=559>512=83

So p(n) is true for n=6.

Let p(k) is true for some k6 and k.

So k3+(k+1)3>(k+2)3

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