bonjour
( 6 x + 9 ) ² = 36 x² + 2 * 6 x * 9 + 81 = 36 x² + 108 x + 81
9 x² - 64 = ( 3 x + 8 ) ( 3 x - 8 )
100 x² - 80 x + 16 = ( 10 x - 4 )²
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bonjour
( 6 x + 9 ) ² = 36 x² + 2 * 6 x * 9 + 81 = 36 x² + 108 x + 81
9 x² - 64 = ( 3 x + 8 ) ( 3 x - 8 )
100 x² - 80 x + 16 = ( 10 x - 4 )²