Răspuns :
a) (x+2)²-(x+3)²=9(x+1)-4(3x-2)-6
x²+4x+4-x²-6x-9=9x+9-12x+8-6
-2x-9= -3x+11
-2x-3x=11+9
-5x=20 |÷ (-5)
x= -4
x²+4x+4-x²-6x-9=9x+9-12x+8-6
-2x-9= -3x+11
-2x-3x=11+9
-5x=20 |÷ (-5)
x= -4