Développer : C = -2 ( 4x + 7) D = (3x + 6) ( 7x – 4 ) Factoriser : E = 49x + 14 F = 50x – 25x²

Développer :
C = -2 ( 4x + 7)  = -8x -14

D = (3x + 6) ( 7x – 4 )
= 21x²-12x+42x-24
= 21x²+30x-24


Factoriser :
E = 49x + 14
7(7x+2)

F = 50x – 25x²
25x(2-x)

Développons
C = -2 ( 4x + 7)C=-8x-14
D = (3x + 6) ( 7x – 4 )D= 21x²-12x+42x-24
D=21x²+30x-24

Factorisons

E = 49x + 14 
E=(7*7*x )+(2*7)
E=7(7x+2)

F = 50x – 25x²
F=(25x*2)-(25x*x)
F=25x(2-x)