Exercises 1—14, to establish a big- O relationship, find witnesses C and k such that | f ( x ) | ≤ C | g ( x ) | whenever x > k . Show that x 3 is O ( x 4 ) but that x 4 is not O ( x 3 ) .
Exercises 1—14, to establish a big- O relationship, find witnesses C and k such that | f ( x ) | ≤ C | g ( x ) | whenever x > k . Show that x 3 is O ( x 4 ) but that x 4 is not O ( x 3 ) .
Solution Summary: The author explains that the given function x3 is Oleft, but it's not true.
(b) Let x € R. Prove that if x² – 2x − 3 ≥ 0, then x² + 1 > 0.
1. Determine whether each of these functions is O(x). a) f (x) = 10 b) f (x) = 3x+7 c) f (x) = x2+x+1 d) f (x) = 5log x e) f (x) = ⌊x⌋ f ) f (x) =⌈x/2⌉
Use graphs to determine if each function f in Exercises 45–48
is continuous at the given point x = c.
[2 – x, if x rational
x², if x irrational,
45. f(x)
c = 2
x² – 3, if x rational
46. f(x) = { 3x +1, if x irrational,
c = 0
[2 – x, if x rational
47. f(x) = { x², if x irrational,
c = 1
x² – 3, if x rational
3x +1, if x irrational,
48. f(x) :
c = 4
Chapter 3 Solutions
Discrete Mathematics and Its Applications ( 8th International Edition ) ISBN:9781260091991
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