bonjour
aire totale = 6 ² = 36
aire blanche = x²
aire grisée = 36 - x²
( x + 7 )² - 25 = x² + 14 x + 49 - 25 = x² + 14 x + 24
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bonjour
aire totale = 6 ² = 36
aire blanche = x²
aire grisée = 36 - x²
( x + 7 )² - 25 = x² + 14 x + 49 - 25 = x² + 14 x + 24