Réponse :
Explications étape par étape :
16x² - 81 = (4x)² - 9 ² = (4x -9 ) ( 4x + 9 )
25x² -50x +25 = 25 ( x² -2x + 1 ) = 25 (x-1)²
(5x -8)( 9x+7) + ( 9x+7 ) ( 6x +9 )
= (9x +7 ) [ (5x -8) + ( 6x +9 ) ]
= (9x +7 ) [ 5x -8 + 6x +9 ]
= (9x +7 ) [ 11 x +1 ]
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Réponse :
Explications étape par étape :
16x² - 81 = (4x)² - 9 ² = (4x -9 ) ( 4x + 9 )
25x² -50x +25 = 25 ( x² -2x + 1 ) = 25 (x-1)²
(5x -8)( 9x+7) + ( 9x+7 ) ( 6x +9 )
= (9x +7 ) [ (5x -8) + ( 6x +9 ) ]
= (9x +7 ) [ 5x -8 + 6x +9 ]
= (9x +7 ) [ 11 x +1 ]