Bonjour ,
Exo 53
A= x(2+x)+5(8-3x)
A= 2x + x^2 + 40 - 15
A= x^2 - 13x + 40
B = -2(5 - 4x)+3x( -8+x)
B= -10+8x -24x+3x^2
B= 3x^2 -16x-10
C = -x(3x+7) +( -5)(9x-1)
C = -3x^2 -7x + (-45x+5)
C = -3x^2-7x-45x+5
C = -3x^2-52x+5
Exo 58
A = 4x^2+7x-10
B = x^2-x-2
C = x^2-7
D = -3x^2+6x-2
Bon courage .