Prealgebra & Introductory Algebra (4th Edition)
4th Edition
ISBN: 9780321955791
Author: Elayn Martin-Gay
Publisher: PEARSON
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Chapter C, Problem 31E
To determine
To find:
How long Alan and Dave Schaferkötter will be able to talk on their long-range walkie-talkies.
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Exercice 2:
Soit & l'ensemble des nombres réels.
Partie A
Soit g la fonction définie et dérivable sur R telle que, pour tout réel x. g(x) = - 2x ^ 3 + x ^ 2 - 1
1. a) Étudier les variations de la fonction g
b) Déterminer les limites de la fonction gen -oo et en +00.
2. Démontrer que l'équation g(x) = 0 admet une unique solution dans R, notée a, et que a appartient à | - 1 ;0|.
3. En déduire le signe de g sur R.
Partie B
Soit ƒ la fonction définie et dérivable sur R telle que, pour tout réel s. f(x) = (1 + x + x ^ 2 + x ^ 3) * e ^ (- 2x + 1) On note f la fonction dérivée de la fonction ƒ sur R.
1. Démontrer que lim x -> ∞ f(x) = - ∞
2. a) Démontrer que, pour tout x > 1
1 < x < x ^ 2 < x ^ 3
b) En déduire que, pour x > 1
0 < f(x) < 4x ^ 3 * e ^ (- 2x + 1)
c) On admet que, pour tout entier naturel n. lim x -> ∞ x ^ n * e ^ (- x) = 0 Vérifier que, pour tout réel x, 4x ^ 3 * e ^ (- 2x + 1) = e/2 * (2x) ^ 3 * e ^ (-2x) puis montrer que: lim x -> ∞ 4x ^ 3 * e…
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Chapter C Solutions
Prealgebra & Introductory Algebra (4th Edition)
Ch. C - Prob. 1PCh. C - Prob. 2PCh. C - Prob. 3PCh. C - Prob. 4PCh. C - Prob. 1ECh. C - Prob. 2ECh. C - Prob. 3ECh. C - Prob. 4ECh. C - Prob. 5ECh. C - Prob. 6E
Ch. C - Prob. 7ECh. C - Prob. 8ECh. C - Prob. 9ECh. C - Prob. 10ECh. C - Prob. 11ECh. C - Prob. 12ECh. C - Prob. 13ECh. C - Prob. 14ECh. C - Prob. 15ECh. C - Prob. 16ECh. C - Prob. 17ECh. C - Prob. 18ECh. C - Prob. 19ECh. C - Prob. 20ECh. C - Prob. 21ECh. C - Prob. 22ECh. C - Prob. 23ECh. C - Prob. 24ECh. C - Prob. 25ECh. C - Prob. 26ECh. C - Prob. 27ECh. C - Prob. 28ECh. C - Prob. 29ECh. C - Prob. 30ECh. C - Prob. 31ECh. C - Prob. 32ECh. C - Prob. 33ECh. C - Prob. 34ECh. C - Prob. 35ECh. C - Prob. 36ECh. C - Prob. 37ECh. C - Prob. 38E
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