Sagot :
bonjour
( 5 x + 9 ) ( x + 2 ) - ( 3 x - 2 ) ( - 4 x - 7 )
= 5 x² + 10 x + 9 x + 18 - ( - 12 x² - 21 x + 8 x + 14 )
= 5 x² + 19 x + 18 + 12 x² + 21 x - 8 x - 14
= 17 x² + 32 x + 4
Bonjour
(5x + 9) (x + 2) - (3x - 2) * (- 4x - 7)
= 5x² + 10x + 9x + 18 - (- 12x² - 21x + 8x + 14)
= 5x² + 10x + 9x + 18 + 12x² + 21x - 8x - 14
= 5x² + 12x² + 10x + 9x + 21x - 8x + 18 - 14
= 17x² + 32x + 4