svp aider moiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
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bonjour
( a + 2 ) ( a - 2 ) = a² - 4
(a + 3 ) ² = a² + 6 a + 9
( a + 5 ) ( 5 a - 1 ) = 5 a² - a + 25 a - 5 = 5 a² + 24 a - 5
( a - 3 )² = a² - 6 a + 9
( a - 5 ) ( 3 a - 1 ) = 3 a² - a - 15 a + 5 = 3 a² - 16 a + 5