2x²-3(x-2)²=62x²-3(x²-4x+4)=62x²-3x²+12x-12-6=0-x²+12x-18=0x²-12x+18=0a=1,b=-12,c=18b²-4ac=144-72=72x=(-12±√72)/2=-6±3√2x1=-6+3√2,x2=-6-3√2