bonsoir
( x - 2 )² - ( x - 3 ) ( x - 4 ) = 3 x - 8
x² - 4 x + 4 - ( x² - 4 x - 3 x + 12 ) = 3 x - 8
x² - 4 x + 4 - x² + 7 x - 12 = 3 x - 8
3 x - 8 = 3 x - 8
9 998 ² - 9 997 x 9 996
x = 10 000
x - 2 = 9 998
x - 3 = 9 997
x - 4 = 9 996
= ( 10 000 - 2 )² - ( 10 000 - 3 ) ( 10 000 - 4 )
= 3 x - 8 donc 3 * 10000 - 8 = 29 992