Bonsoir,
(a+b)²- (a-b)²
a² -b² = (a-b) ( a+b)
(a+b -a+b) ( a+b-a+b)
= b² -b²
= 2b²
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Bonsoir,
(a+b)²- (a-b)²
a² -b² = (a-b) ( a+b)
(a+b -a+b) ( a+b-a+b)
= b² -b²
= 2b²