bonsoir
( x + 3)² - x² = x² + 6 x + 9 - x² = 6 x + 9
Bonjour
X^ + 6x + 9 -x^2
6x+9
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bonsoir
( x + 3)² - x² = x² + 6 x + 9 - x² = 6 x + 9
Bonjour
X^ + 6x + 9 -x^2
6x+9