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Lounadu38
@Lounadu38
May 2019
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Bonsoir,
Pourriez-vous m'aider s'il vous plaît?
C'est l'exercice 80 et le 74.
Merci d'avance
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MonsieurFirdown
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Bonjour
74
♧1. Développer :
f(x) = 8 - 9(x-5)²
f(x) = 8- 9( x² - 10x + 25 )
f(x) = – 9x² + 90x - 217
♧2. f′(x) = -18x + 90
♧3. & 4.
f′(x) = -18x + 90
- 18x + 90 = 0
- 18x = - 90
x = 5
|--(x)--|--( -∞ )-----( 5 )-------( +∞ )----|
|f'(x)--|------ (+) -- 0 ---- (-)-------------|
|f(x)--|------(/)----- 8 --------(\)----------|
(\) --> décroissante
(/) --> croissante
Voilà ^^
2 votes
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Lista de comentários
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Bonjour74
♧1. Développer :
f(x) = 8 - 9(x-5)²
f(x) = 8- 9( x² - 10x + 25 )
f(x) = – 9x² + 90x - 217
♧2. f′(x) = -18x + 90
♧3. & 4.
f′(x) = -18x + 90
- 18x + 90 = 0
- 18x = - 90
x = 5
|--(x)--|--( -∞ )-----( 5 )-------( +∞ )----|
|f'(x)--|------ (+) -- 0 ---- (-)-------------|
|f(x)--|------(/)----- 8 --------(\)----------|
(\) --> décroissante
(/) --> croissante
Voilà ^^