Bonsoir quelqu'un peut m'aider ? ( x + 6 )² = x ² + 2 × x × 6+ 6 ² =
(a-7)² = a² - 2 ×a ×7 + 7 ² =
( x - 3 )(x + 3)= x² - x² =
(a-7)² = a² - 2 ×a ×7 + 7 ² =
( x - 3 )(x + 3)= x² - x² =
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