bonjour
A = x² - 10 x +25 - ( x² - 6 x + 9 )
= x² - 10 x + 25 - x² + 6 x - 9
= - 4 x + 16
B = 4 x² - 4 x + 1 + 6 x - 12
= 4 x² + 2 x - 11
C = x² - 5 x - 2 x + 10 + x² - 12 x + 36
= 2 x² - 19 x + 46
D = 4 x² + 4 x + 1 + 16 x² - 8 x + 1
= 20 x² - 4 x + 2
A = ( 2 x - 1 ) ( 3 x - 6 ) = 0
x = 1/2 ou 6/3 = 2
B = ( 2 x + 5 ) ( 2 x + 5 + x + 3 )
( 2 x + 5 ) ( 3 x + 8 )
= 0 pour x = - 5/2 ou - 8/ 3
C = 6 x /2 = 2 x + 6
3 x = 2 x + 6
3 x - 2 x = 6
x = 6
D ) x² - 6 x = 0
x ( x - 6) = 0
x = 0 ou 6