aidez moi c'est hurgent svp.... Pergunta de ideia deallan2

January 2021 1 43 Report

aidez moi c'est hurgent svp

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Bonsoir,

1)
A = (2x + 1)² - (5x - 7)²
A = 4x² + 4x + 1 - (25x² - 70x + 49)
A = 4x² + 4x + 1 - 25x² + 70x - 49
A = 4x² - 25x² + 4x + 70x + 1 - 49
A = - 21x² + 74x - 48

2)
A = (2x + 1)² - (5x - 7)²
A = (2x + 1 - 5x + 7) (2x + 1 + 5x - 7)
A = (- 3x + 8) (7x - 6)

3) A = 0
(- 3x + 8) (7x - 6) = 0
- 3x + 8 = 0 ou 7x - 6 = 0
- 3x = - 8 ou 7x = 6
x = 8/3 ou x = 6/7

4)
4 (3x - 7) = 8 (- 5 + x)
12x - 28 = - 40 + 8x
12x - 8x = - 40 + 28
4x = 12
x = 12/4
x = 3

allan2 merci bcp

maudmarine De rien

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