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Sagot :

x = 5 racine de 2

 

F(x) = 16x² - 56x - 32

F(x) = 16 * ( 5racine de 2)² - 56 * 5 racine de 2 - 32

F(x) = 16 * ( 25*2) - 56 * 5racine de 2 - 32

F(x) = 16 * 50 - 280 racine de 2 - 32

F(x) = 800 - 280 racine de 2 - 32

F(x) = 768 - 280 racine de 2

 

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