Sagot :
A = (x + 3)²
A = x² + 6x + 9
B = (x + 5)²
B = x² + 10x + 25
C = (2x + 6)²
C = 4x² + 24x + 36
D = (3x + 2)²
D = 9x² + 12x + 4
A=(x+3)²
A=x²+6x+9
B=(x+5)²
B=x²+10x+25
C=(2x+6)²
C=4x²+24x+36
D=(3x+2)²
D=9x²+12x+4
voilà...... :)