Sagot :
Hello
G = ( x - 3 ) ( 2x + 1 + 5x - 7 )
= 2x² + x + 5x² -7x -6x -3 -15x + 21
= 2x² + 5x² + x - 7 x -6x - 15x - 3 + 21
= 7x² - 27x + 18
K = ( 3x + 2 ) ( -5x - 7 -x - 7 )
= -15x² -21x -3x² - 21x -10x - 14 -2x - 14
= -18x² - 42 x - 12x - 28
= -18x² -54x -28
bonne journée