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louanejuillerat1004
@louanejuillerat1004
May 2022
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je dois développer l'expression suivante :
(4x-2)×(-x+5)-(4x-2)²
svpppp
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hirondelle52
Bonsoir, (4x-2)×(-x+5)-(4x-2)²on factorise d'abord, ce sera plus facile:(4x-2) ( -x+5 -4x+2) = (4x-2) ( -5x +7)= -20x² +28x +10x -14= -20x² + 38x -14
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louanejuillerat1004
merciii tu me sauve
dalalthecleverest
Bonsoir :)Réponse en explications étape par étape :- Question : Développer l'expression suivante :A = (4x - 2)(- x + 5) - (4x - 2)²A = - (4x * x) + (4x * 5) + (2 * x) - (2 * 5) - [(4x)² - (2 * 4x * 2) + (2)²]A = - 4x² + 20x + 2x - 10 - (16x² - 16x + 4)A = - 4x² + 22x - 10 - 16x² + 16x - 4A = - 4x² - 16x² + 22x + 16x - 10 - 4A = - 20x² + 38x - 14Voilà
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