Répondre :
A = 3( x + 5 )
= 3x + 15
B = 5(6 - x )
= 30 -5x
C = 10(3+ x )
= 30+10x
D = 7( x - 3 )
= 7x -21
E = 4(2x+3)
= 8x +12
F = 2( 5x - 9 )
= 10x -18
G = -5 ( x + 2 )
-5x-10
H = - 3 ( x - 2 = -3x +6
I = x( x + 3 )
x²+3x
J = x ( 4 - x )
= 4x -x²
K = -3x ( x + 4 )
-3x²-12
L = 2x ( x - 7 )
= 2x²-14
M = 6x ( 2x + 1 )
12x²+6x
N = - 4x ( 5x - 10 )
= -20x²+40
= 20 ( -x²+2)