EX 84 :
A = 3x + 12
A = 3(x + 4)
B = 9x + 15
B = 3(3x + 5)
C = 6x - 6
C = 3(2x - 2)
D = 36x + 6
D = 3(12x + 2)
EX 85
A = 2x + 2*3
A = 2x + 6
A = 2(x + 3)
B = 5*4 - 5x
B = 20 - 5x
B = 5(4 - x)
C = 7x + 21
C = 7(x + 3)
D = 26 - 13x
D = 13(2 - x)
Exercice 84.
mettre 3 en facteur
3x +12 = 3(x+4)
9x +15
3(3x + 5)
6x -6 = 3(2x -2)
36x +6
3( 12 x +2)
Exercice 85
factorisation
2x +2 X 6
2x +6
2(x +3)
5 X 4 -5x =
20 -5x
5(4 -x)
7x +21 = 7(x +3)
26 -13x = 13( 2-x)
