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thechocolatine1
@thechocolatine1
January 2021
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Bonjour je n'arrive pas à mon exercice .. pouvez vous m'aider ?
La question est ...
COMPLÉTEZ CES DÉVELOPPEMENTS :
(5y+4)²
(3b-5)²
7²-(9Xx)²
S'il vous plaît aidez moi
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remilesochalieoz9a2c
Verified answer
Salut ! :)
Il suffit d'appliquer les identités remarquables :
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(a + b)(a - b) = a² - b²
(5y + 4)² = (5y)² + 2×5y×4 + 4² = 25y² + 40y + 16
(3b - 5)² = (3b)² - 2×3b×5 + 5² = 9b² - 30b + 25
7² - (9x)² = (7 - 9x)(7 + 9x)
Voilà ! :)
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Lista de comentários
Verified answer
Salut ! :)Il suffit d'appliquer les identités remarquables :
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(a + b)(a - b) = a² - b²
(5y + 4)² = (5y)² + 2×5y×4 + 4² = 25y² + 40y + 16
(3b - 5)² = (3b)² - 2×3b×5 + 5² = 9b² - 30b + 25
7² - (9x)² = (7 - 9x)(7 + 9x)
Voilà ! :)