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Sagot :

(4x²+1+4x)-(x²+9+6x)=3x²-2x-8
AENA12
A = (2x+1)² - (x+3)²
A = (4x² + 4x + 1) - (x² + 6x + 9)
A = 4x² + 4x + 1 -x² - 6x - 9
A = 3x² - 2x - 8 

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