Réponse:
3x² + 6x - 7 - [ 5 ( 2x -5 ) + x ( 2x - 5 ) ]
3x² + 6x - 7 - [ 10x - 25 + 2x² - 5x ]
3x² + 6x - 7 - 10x + 25 - 2x² + 5x
( 3x² - 2x² ) + ( 6x + 5x - 10x ) + ( 25 - 7 )
x² + x + 18
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Réponse:
3x² + 6x - 7 - [ 5 ( 2x -5 ) + x ( 2x - 5 ) ]
3x² + 6x - 7 - [ 10x - 25 + 2x² - 5x ]
3x² + 6x - 7 - 10x + 25 - 2x² + 5x
( 3x² - 2x² ) + ( 6x + 5x - 10x ) + ( 25 - 7 )
x² + x + 18