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Mitsuru
@Mitsuru
January 2021
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Hello ! Je suis un élève de première et je suis coincé sur le petit 2 de ce devoir de maths.
Merci de votre réponse !
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swnn
2. a. bénéfice = recettes - coût de production donc
B(x)= 3x - (x²-8x+18) = 3x-x²+8x-18 = -x²+11x-18
b. -(x-(11/2))² + (49/4) = - (x²-(22/2)x+(121/4)) + (49/4) = - (x²-11x+(121/4)) + (49/4) = -x²+11x-(121/4)+(49/4) = -x²+11x-18 = B(x)
c. factorisation de B
-(x-(11/2))² + (49/4)
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Mitsuru
Je ne comprends pas pour le petit C tu n'as rien changé à B (x)
swnn
selon moi, la factorisation de B(x) c'est la forme canonique trouvée dans le petit b.
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B(x)= 3x - (x²-8x+18) = 3x-x²+8x-18 = -x²+11x-18
b. -(x-(11/2))² + (49/4) = - (x²-(22/2)x+(121/4)) + (49/4) = - (x²-11x+(121/4)) + (49/4) = -x²+11x-(121/4)+(49/4) = -x²+11x-18 = B(x)
c. factorisation de B
-(x-(11/2))² + (49/4)