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Lanznicolas
@Lanznicolas
May 2019
2
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Bonjour j'ai besoin d'aide pour cet exercice :
On donne A=(x-6)(2-x) et B=(x-3)(4-x)
1- développer et réduire chaque expression
2- calculer A-B
3-Comparer A et B selon le signe de x
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scoladan
Verified answer
Bonjour, A = (x-6)(2-x)=2x -x^2 -12 + 6x = -x^2 + 8x - 12 B = (x-3)(4-x) = 4x -x^2 -12 + 3x = -x^2 + 7x -12
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scoladan
A-B = x
scoladan
Ah oui pardon les ^2 c'est au carré
scoladan
Si x>0 alors A- B >0 et donc À > B
scoladan
Et inversement si x <0 A < B
scoladan
2) A-B = x
khedoushka
J'ai réussi que ça après je comprends pas la 2ème question
0 votes
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Lista de comentários
Verified answer
Bonjour, A = (x-6)(2-x)=2x -x^2 -12 + 6x = -x^2 + 8x - 12 B = (x-3)(4-x) = 4x -x^2 -12 + 3x = -x^2 + 7x -12