Bjr je galère à faire cet exercice du niveau seconde, je met beaucoup de point en jeu, pouvez-vous m.... Pergunta de ideia deTHavenger

THavenger @THavenger

April 2019 1 73 Report

Bjr je galère à faire cet exercice du niveau seconde, je met beaucoup de point en jeu, pouvez-vous m'aider svp? Merci d'avance

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trudelmichel

Verified answer

Aire AEFG= X²
Aire FICH=
HC=10-x
Aire( FICH =(10-x)²=100+x²-20x
Aire colorée = x²+x²+100-20x=2x²-20x+100
Si Aire colorée <ou=58
2x²-20x+100< ou=58
2x²-20x+42< ou= 0

(2x-6)(x-7)=(2x²-6x-14x+42)= 2x²-20x+48
(2x-6)(x-7) < ou= 0    signe (2x-6)(x-7) = -
   x    - infini 3    7 + inf
2x-6 signe -   0 signe + signe +
x-7    signe -    signe - 0 signe +

(2x-6)(x-7) signe + 0 signe - 0 signe +

d'où 3<OU= x<ou = 7 x appartient [3;7]

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