Bonsoir,
A = 49x² - 100
(7x -10) ( 7x+10 ) = 49x² - 10
C = (3x – 7)
pas de factorisation
ni de dévelopement
B = (2x - 5)² – 36
(2x-5-6) (2x-5+6) = (2x -11) ( 2x+1)
= 4x² +2x -22x -11 = 4x² -20x -11
D = (4x - 1) (4x + 1)
16x² -1
16x² +4x -4x -1 = 16x² -1