bonjour
( x + 5 ) ( 3 x - 2 ) = 3 x² - 2 x + 15 x - 10 = 3 x² + 13 x - 10
( 2 x - 4 ) ( 5 x + 7 ) = 10 x² + 14 x - 20 x - 28 = 10 x² - 6 x - 28
( 4 x - 7 ) ( 3 x - 5 ) = 12 x² - 20 x - 21 x + 35 = 12 x² - 41 x + 35
7 x² + ( 3 x - 2 ) ( 5 x + 8 ) = 7 x² + 15 x² + 24 x - 10 x - 16 = 22 x² + 14 x - 16