bonjour
A= (x + 1)2 - (x + 7)2
= ( x + 1 + x + 7 ) ( x + 1 - x - 7 )
= ( 2 x + 8 ) ( - 6 )
b B = (2x + 5)2 - (2x + 3)2
= ( 2 x + 5 + 2 x + 3 ) ( 2 x + 5 - 2 x - 3 )
= ( 4 x + 8 ) ( 2 )
c C= (4x - 7)2 – (3x + 5)2
= ( 4 x - 7 + 3 x + 5 ) ( 4 x - 7 - 3 x - 5 )
= ( 7 x - 2 ) ( x- 12 )
fais le dernier
d D= (2 + 5x)2 – (4x - 1)2
