Răspuns :
4x²+12x+9-2(x²-1)+15=3(4-4x+x²)-11
4x²+12x+9-2x²+2+15=12-12x+x²-11
4x²+x²=12x-12x+9+2+15+12-11
5x²=27
x²=27 supra 5
4x²+12x+9-2x²+2+15=12-12x+x²-11
4x²+x²=12x-12x+9+2+15+12-11
5x²=27
x²=27 supra 5