bonsoir
d = 10 x² + 8 x - 15 x - 12 + 27 x² + 18 x - 12 x + 8
d = 37 x² - x - 20
e = 10 x² + 8 x - 15 x - 12 - ( 27 x² + 18 x - 12 x + 8)
e = 10 x² - 7 x - 12 - 27 x² - 18 x + 12 x - 8
e = - 17 x² - 13 x - 20
J = ( 2 x + 7) ( 2 x + 7 + 5 - 3 x - 1)
J = ( 2 x + 7) ( - x + 11)
K = ( x + 1) ( 2 x - 5) + ( x + 1) ( x - 1)
K = ( x + 1) ( 2 x - 5 + x - 1)
K = ( x + 1) ( 3 x - 6)