Développer les expression suivantes A: 3(x-1)+(x+2) B:-3x(x+3)+(4x+1)(-x+2) E:(2x+1)² G:(-2x+1)²-(3x-4)² B:2x(-x+2)+x²-4 D:(-3x+1)(x-1)-(x²-4x) F:(3x-4)(3x-4) F

bonsoir

A = 3 x -3 + x + 2 =  4 x - 1

B = - 3 x² - 9 x + (- 4 x² + 8 x - x + 2)
B = - 3 x² - 9 x - 4 x² + 8 x - x + 2
B = - 7 x² - 2 x + 2

e = 4 x² + 4 x +1

g = ( - 2 x + 1 + 3x -4) ( - 2 x +1 - 3 x +4)
G = ( x - 3 ) ( - 5 x + 5)

B = - 2 x² + 4 x + x ² -4
B = - x² + 4 x - 4

d = ( - 3 x² + 3 x + x - 1) - x² + 4 x
D = - 3 x² + 4 x - 1 - x² + 4 x
D = - 4 x² + 8 x - 1

f = 9 x² - 16

A = ( 2 x +1) ( x +3 + 2 x - 5)
A = ( 2 x +1) ( 3 x - 2)

A= 3(x-1)+(x+2)
=3x-3+3x+6
=9x+3

F=(3x-4)(3x-4)
=9x²+12x-12x-8
=9x²+0x²-8
=81x²-8