Exercises 1—14, to establish a big- O relationship, find witnesses C and k such that | f ( x ) | ≤ C | g ( x ) | whenever x > k . Use the definition of “ f ( x ) is O ( g ( x ) ) ” to show that x 4 + 9 x 3 + 4 x + 7 is O ( x 4 ) .
Exercises 1—14, to establish a big- O relationship, find witnesses C and k such that | f ( x ) | ≤ C | g ( x ) | whenever x > k . Use the definition of “ f ( x ) is O ( g ( x ) ) ” to show that x 4 + 9 x 3 + 4 x + 7 is O ( x 4 ) .
Solution Summary: The author explains the formula used to prove that f(x)=O(g) if there are witnesses (numbers).
In Exercises 27–28, let f and g be defined by the following table:
f(x)
g(x)
-2
-1
3
4
-1
1
1
-4
-3
-6
27. Find Vf(-1) – f(0) – [g(2)]² + f(-2) ÷ g(2) ·g(-1).
28. Find |f(1) – f0)| – [g(1)] + g(1) ÷ f(-1)· g(2).
Suppose f and g are the piecewise-defined functions defined
here. For each combination of functions in Exercises 51–56,
(a) find its values at x = -1, x = 0, x = 1, x = 2, and x = 3,
(b) sketch its graph, and (c) write the combination as a
piecewise-defined function.
f(x) = {
(2x + 1, ifx 0
g(x) = {
-x, if x 2
8(4):
51. (f+g)(x)
52. 3f(x)
53. (gof)(x)
56. g(3x)
54. f(x) – 1
55. f(x – 1)
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