exercice 1 : développer
A =3(x+2)
A = 3x + 6
B = 6x(2+9x)
B = 12x + 54x²
C =x (x+1)
C = x² + x
D =7 (3x-8)
D = 21x - 56
exercice 2 : factoriser
A = 8x + 12 y
A= 4 (2x + 3y)
B = 49x + 56y
B = 7 (7x + 8y)
C = 25x² + 8x
C = x (25x +8)
Exercice 3 :
calcule A et B pour x = 3
A = 4x+2
A = (4*3) +2
A = 12+2
A = 14
B = 3x²+8x
B = (3*3²) + (8*3)
B = 27 + 24
B = 51