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Liiisaaa
@Liiisaaa
January 2021
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salut je bloque pour la question 2) b et c
merci d'avance
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scoladan
Verified answer
Bonjour,
2) b) Le profit est maximal quand Cm(x) = 28 sur l'intervalle où Cm est croissante.
Cm est croissante sur [6;12]
Voir courbes ci-joint
On lit graphiquement Cm(9) = 28 donc x = 9 litres de shampooing.
c) 2x² - 24 x + 82 = 28
⇔ 2x² - 24x + 54 = 0
⇔ x² - 12x + 27 = 0
Δ = (-12)² - 4x1x27 = 144 - 108 = 36 = 6²
Donc 2 solutions :
x = (12 - 6)/2 = 3 ∉ [6;12], intervalle sur lequel Cm est croissante
x = (12 + 6)/2 = 9
2 votes
Thanks 1
Liiisaaa
super merci beaucoup
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Bonjour, je comprends pas comment on trouve an+1= 0,6an+550 merci pour votre aide
Responda
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Lista de comentários
Verified answer
Bonjour,2) b) Le profit est maximal quand Cm(x) = 28 sur l'intervalle où Cm est croissante.
Cm est croissante sur [6;12]
Voir courbes ci-joint
On lit graphiquement Cm(9) = 28 donc x = 9 litres de shampooing.
c) 2x² - 24 x + 82 = 28
⇔ 2x² - 24x + 54 = 0
⇔ x² - 12x + 27 = 0
Δ = (-12)² - 4x1x27 = 144 - 108 = 36 = 6²
Donc 2 solutions :
x = (12 - 6)/2 = 3 ∉ [6;12], intervalle sur lequel Cm est croissante
x = (12 + 6)/2 = 9