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Sagot :

(a+b)²=a²+2ab+b²

(a-b)²=a²-2ab+b²

(a+b)(a-b)= a²-ab+ba-b²=a²-b²

 

(a+b)²= (a+b)(a+b)

= a² + 2ab + b²

 

(a-b)² = (a-b)(a-b)

=a² - 2ab + b²

 

(a+b)(a-b)

= a-b

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