Consider the function x² + 4x + 17. Click and drag statements to prove that x³ is not Q(x² + 4x + 17). Then, x³ 1(x² + 4x + 17) when x = 4. Let x² + 4x +17 ≤ 3x³ for all x> 17 so, x² + 4x + 17 is O(x³), with witnesses C = 3, k = 17. It follows that, x³> x² when x> 4. For x ≤ 3C, clearly impossible for the constant C to satisfy for all large x. It follows that, x < 3C. Therefore, x³ is not O(x² + 4x + 17). However, if x³ were O(x² + 4x + 17), then x³ k.
Consider the function x² + 4x + 17. Click and drag statements to prove that x³ is not Q(x² + 4x + 17). Then, x³ 1(x² + 4x + 17) when x = 4. Let x² + 4x +17 ≤ 3x³ for all x> 17 so, x² + 4x + 17 is O(x³), with witnesses C = 3, k = 17. It follows that, x³> x² when x> 4. For x ≤ 3C, clearly impossible for the constant C to satisfy for all large x. It follows that, x < 3C. Therefore, x³ is not O(x² + 4x + 17). However, if x³ were O(x² + 4x + 17), then x³ k.
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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