bonsoir
( x + 10 ) ² = x² + 20 x + 100
( x + 9 ) ( x - 9 ) = x² - 81
x + 16 x + 64 = ( x + 8 )²
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bonsoir
( x + 10 ) ² = x² + 20 x + 100
( x + 9 ) ( x - 9 ) = x² - 81
x + 16 x + 64 = ( x + 8 )²