2x²+x-3=0(2x+3)(x-1)=0x=-3/2 x=12t²-7t-1=0t²-7t/2+49/16=1/2+49/16(t-7/4)²=57/16t-7/4=±√57/4t=7/4+√57/4 t=7/4-√57/4
