Exercice n*1
1.
A = (2x-1)^2 - (3x +2)^2
A = (4x^2 - 4x + 1) - (9x^2 + 12x + 4)
A = -5x^2 - 16x - 2
2.
A = (-x - 3)(5x + 1)
A = -5x^2 -1x -15x -3
A = -5x^2 - 16x - 3
3.
A = ((-1/2) - 3) * (5*(1/2) + 1)
A = ((-1/2) - (6/2)) * ((5/2) +(2/2))
A = (-7/2) * (7/2)
A = -49/4
4.
(-x - 3)(5x + 1) = 0
donc :
(-x -3) = 0
ou
(5x +1) = 0
donc :
(-x-3) = 0
-x = 3
x = -3
et
(5x +1) = 0
5x = -1
x = -1/5
x = -0,2
Les solutions de l'équation sont { -0,2 et -3 }
Voici déjà l'exo n*1