bonjour
E = ( x - 3 )² - ( x - 1 ) ( x - 2 )
a. E = x² - 6 x + 9 - ( x² - 2 x - x + 2 )
E = x² - 6 x + 9 - x² + 3 x - 2 = - 3 x + 7
b . 99 997 ² - 99 999 x 99 998
x = 1 00 000 ; x - 3 = 99 997 ; x - 1 = 99 999 et x - 2 = 99 998
= - 3 x + 7 donc - 300 000 + 7 = - 299 993
c. F = ( 4 x + 1 )² - ( 4 x + 1 ) ( 7 x - 6 )
F = ( 4 x + 1 ) ( 4 x + 1 - 7 x + 6 )
F = ( 4 x + 1 ) ( - 3 x + 7 )
x = - 1/4 ou 7/3
