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Greugreurivet
@Greugreurivet
May 2019
2
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Bonjour je n’arrive pas à faire les exercices 27/28/29 !
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habbassalmap4zaio
Verified answer
Exemple :
A = ( 5x + 2 )2
A = (5x)2 + 2 × 5x × 2 + 22
A = 25x2 + 20x + 4
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MonsieurFirdown
Bonjour
♡ Rappel : Identité remarquable :
--> (a+b)² = a² + 2ab + b²
--> (a-b)² = a² - 2ab + b²
--> (a-b)(a+b) = a² - b²
27
A = (x+3)²
A = x² + 2×x×3 + 3²
A = x² + 6x + 9
28
A = (x-5)²
A = x² - 2×x×5 + 5²
A = x² -10x + 25
29
A = (x+7)(x-7)
A = x² - 7²
A = x² - 49
Voilà ^^
1 votes
Thanks 1
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Verified answer
Exemple :A = ( 5x + 2 )2
A = (5x)2 + 2 × 5x × 2 + 22
A = 25x2 + 20x + 4
♡ Rappel : Identité remarquable :
--> (a+b)² = a² + 2ab + b²
--> (a-b)² = a² - 2ab + b²
--> (a-b)(a+b) = a² - b²
27
A = (x+3)²
A = x² + 2×x×3 + 3²
A = x² + 6x + 9
28
A = (x-5)²
A = x² - 2×x×5 + 5²
A = x² -10x + 25
29
A = (x+7)(x-7)
A = x² - 7²
A = x² - 49
Voilà ^^