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CHARL7
@CHARL7
January 2021
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bonjour pouvez vous m'aider pour mon devoir?
Factorisez cette expression (4x-3)² - (2x+4)²
merci
pour info x n'est pas un signe de multiplication
merci
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billyatemycake
Bonjour,
Il s'agit de faire la différence entre deux identités remarquables de type :
(a-b)² = a² - 2ab + b² suivi de (a+b)² = a² + 2ab + b²;
A = ((4*x-3)^2-(2*x+4)^2)
A = (16x² -24x +9) - (4x² + 16x + 16)
A = 16x² -24x +9 -4x² -16x -16
A = 12x² -40x -7
mise en facteur de (4x-3)² -(2x+4)²
12x² - 40x -7.......=
(2x-7)(6x+1)
1 votes
Thanks 1
CHARL7
merçi mais ta réponse n'est pas correcte
Eliott78
Verified answer
4x²-2*4*X -3
²
4X
²- 8X²- 3
²
-4X
² -3
²
2X
²+ 2*X*4- 4
²
2X
²+ 8X²-4
²
10X
²-4
²
2 votes
Thanks 1
CHARL7
MERCI BEAUCOUP
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Lista de comentários
Il s'agit de faire la différence entre deux identités remarquables de type :
(a-b)² = a² - 2ab + b² suivi de (a+b)² = a² + 2ab + b²;
A = ((4*x-3)^2-(2*x+4)^2)
A = (16x² -24x +9) - (4x² + 16x + 16)
A = 16x² -24x +9 -4x² -16x -16
A = 12x² -40x -7
mise en facteur de (4x-3)² -(2x+4)²
12x² - 40x -7.......= (2x-7)(6x+1)
Verified answer
4x²-2*4*X -3²4X²- 8X²- 3²
-4X² -3²
2X²+ 2*X*4- 4²
2X²+ 8X²-4²
10X²-4²