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crameussebg
@crameussebg
January 2021
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Aider moi svp je comprend rien .Si possible d'avoir toutes les réponses et expliquer les enonsser
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maudmarine
Verified answer
Bonjour,
1) a)
Pour x = 5
A = (x - 5) (6x + 14) + (x - 5)²
A = (5 - 5) (6 * 5 + 14) + (5 - 5)²
A = (0) (30 + 14) + 0²
A = 0
B = (4x + 2)² - (3x + 7)²
B = (4 * 5 + 2)² - (3 * 5 + 7)²
B = (20 + 2)² - (15 + 7)²
B = 22² - 22²
B = 0
b)
On peut en conclure que A = B
A = (x - 5) (6x + 14) + (x - 5)²
A = 6x² + 14x - 30x - 70 + x² - 10x + 25
A = 6x² + x² + 14x - 30x - 10x - 70 + 25
A = 7x² - 26x - 45
B = (4x + 2)² - (3x + 7)²
B = 16x² + 16x + 4 - (9x² + 42x + 49)
B = 16x² + 16x + 4 - 9x² - 42x - 49
B = 16x² - 9x² + 16x - 42x + 4 - 49
B = 7x² - 26x - 45
Donc : A = B
car 7x² - 26x - 45 = 7x² - 26x - 45
2 votes
Thanks 1
crameussebg
Merci beaucoup si j'ai une bonne note c'est grâce à toi
maudmarine
Jespère !
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Lista de comentários
Verified answer
Bonjour,1) a)
Pour x = 5
A = (x - 5) (6x + 14) + (x - 5)²
A = (5 - 5) (6 * 5 + 14) + (5 - 5)²
A = (0) (30 + 14) + 0²
A = 0
B = (4x + 2)² - (3x + 7)²
B = (4 * 5 + 2)² - (3 * 5 + 7)²
B = (20 + 2)² - (15 + 7)²
B = 22² - 22²
B = 0
b) On peut en conclure que A = B
A = (x - 5) (6x + 14) + (x - 5)²
A = 6x² + 14x - 30x - 70 + x² - 10x + 25
A = 6x² + x² + 14x - 30x - 10x - 70 + 25
A = 7x² - 26x - 45
B = (4x + 2)² - (3x + 7)²
B = 16x² + 16x + 4 - (9x² + 42x + 49)
B = 16x² + 16x + 4 - 9x² - 42x - 49
B = 16x² - 9x² + 16x - 42x + 4 - 49
B = 7x² - 26x - 45
Donc : A = B car 7x² - 26x - 45 = 7x² - 26x - 45