Réponse :
1. A= (-7x - 1 ) 2+ ( -7x -1)(-4x - 6 )
= -14x - 2 + 28x²+ 42 + 4x + 6
= 28x² -14x + 46
2. A= (-7x - 1 ) 2+ ( -7x -1)(-4x - 6 )
= ( -7x - 1) (2+(-4x - 6))
=(-7x -1) (4x -4)
3. A= (-7x - 1 ) 2+ ( -7x -1)(-4x - 6 )
= (-7x 0 -1 ) 2 + ( -7x0 -1 ) (-4 x 0 -6)
= (0 -1) 2+ ( 0-1 ) (0 -6)
= -2 + (-6)
= -8
4. A = 0
(-7x - 1 ) 2+ ( -7x -1)(-4x - 6 ) = 0
28x² -14x + 46 =0
....