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intervalles monotones x2−36x−20
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Solution
Décroissant:−∞<x<18,Croissant:18<x<∞
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Définition des intervalles monotones
Si f′(x)>0alors f(x)est croissant. Si f′(x)<0alors f(x)est décroissant.
f′(x)=2x−36
Trouver des intervalles:Décroissant:−∞<x<18,Croissant:18<x<∞
