Aide SVP URGENT x (c'est la lettre) J=(3x+5)au carré + 6x+11 K=4(2x+1)au carré -8x-3 L=(2x+1)au carré + 6(2x+1)+9 M=(3x-7)au carré-(2x+5)au carré Merci d'avance

bonsoir

j = 9 x² + 30 x + 25 + 6 x +11
j = 9 x² + 36 x + 36

k = 4 ( 4 x² + 4 x +1) - 8 x -3
k = 16 x² + 16 x + 4 - 8 x -3
k = 16 x² + 8 x + 1

l = 4 x² + 4 x +1 + 12 x + 6 + 9
l = 4 x² + 16 x + 16
m = (3 x - 7 + 2 x + 5) ( 3 x - 7 - 2 x - 5)
m  = ( 5 x - 2) ( x - 12)

J=(3x+5)au carré + 6x+11
J = 9x²+30x+25+6x+11
J = 9x²+36x+36
J = (3x)²+2*3x*6+6²
J = (3x+6)²

K=4(2x+1)au carré -8x-3
K = 4(4x²+4x+1)-8x-3
K = 16x²+16x+4-8x-3
K = 16x²+8x+1
K = (4x)²+2*4x*1+1²
K = (4x+1)²

L=(2x+1)au carré + 6(2x+1)+9
L = (4x²+4x+1)+12x+6+9
L = 4x²+16x+16
L = (2x)²+2*2x*4+4²
L = (2x+4)²

M=(3x-7)au carré-(2x+5)au carré
M = (3x-7+2x+5)(3x-7-2x-5)
M = (5x-2)(x-12)