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Alison777
@Alison777
April 2019
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Pourriez vous m'aider a cette exercice;
Développer et réduire les expressions suivantes;
A= (3x + 2)² - (x - 1)²
B= (a + 5) (a - 5) + (3a + 1)(a - 5)
merci de vos réponses. :)
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isapaul
Verified answer
Bonsoir
A = (3x+2)²-(x-1)² est de forme a²-b² =(a-b)(a+b) où a = 3x+2 et b = x-1
A = (3x+2-x+1)(3x+2+x-1)
A = (2x+3)(4x+1)
B =(a+5)(a-5)+(3a+1)(a-5)
B =(a-5)( a+5+3a+1)
B = (a-5)(4a+6)
1 votes
Thanks 1
alison777
merci , vous m'avez bien aider , bonne soirée! :)
isapaul
de rien Bonne soirée aussi merci
mel004
Bonsoir !
A= a^2 + 2ab + b^2 - ( a^2 - 2ab + b^2)
= 9x^2 + 12x + 4 - x^2 + 2x - 1
= 8x^2 + 13 x -3
B= a^2 - b^2 + (3a + 1) (a - 5)
= a^2 - 25 + 3a^2 - 15a + a - 5
= 4a^2 -14 a - 30
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Thanks 0
alison777
qu'est ce que ''^'' ?
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Bonsoir, pourriez vous m'aider? merci!
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Verified answer
BonsoirA = (3x+2)²-(x-1)² est de forme a²-b² =(a-b)(a+b) où a = 3x+2 et b = x-1
A = (3x+2-x+1)(3x+2+x-1)
A = (2x+3)(4x+1)
B =(a+5)(a-5)+(3a+1)(a-5)
B =(a-5)( a+5+3a+1)
B = (a-5)(4a+6)
A= a^2 + 2ab + b^2 - ( a^2 - 2ab + b^2)
= 9x^2 + 12x + 4 - x^2 + 2x - 1
= 8x^2 + 13 x -3
B= a^2 - b^2 + (3a + 1) (a - 5)
= a^2 - 25 + 3a^2 - 15a + a - 5
= 4a^2 -14 a - 30