Proving inequalities with induction requires a good grasp of the 'flexible' nature of inequalities when compared to equations. Make sure that your logic is clear between lines!
For more mathematical induction proofs with inequalities, try these:
Inequality Proof Example 1, Σ(k = 1 to n) 1/k² ≤ 2 - 1/n:
http://youtu.be/S2tkLx019QI
Inequality Proof Example 2, n² ≥ n:
http://youtu.be/BTnbWKTeonk
Inequality Proof Example 3, 5^n + 9 lesser than 6^n:
http://youtu.be/5iWlsp55N_s
Inequality Proof Example 4, n! greater than n²:
http://youtu.be/5uFiA63Up9c
Inequality Proof Example 5, 2^n ≥ n²
http://youtu.be/cXNdy-HHqrA
Inequality Proof Example 6, [2^(2n)]*(n!)^2 ≥ (2n)!
http://youtu.be/6xdbKjZkjcg
For videos on other kinds of mathematical induction, see my playlist on this topic: http://www.youtube.com/playlist?list=PL5KkMZvBpo5Bf6wS0saU1yNvDxBWN5o9j
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