9x^2+6x+1=49x^2+6x-3=03(3x^2+2x-1)=03x^2+2x-1=0(3x-1)(x+1)=0x=1/3或x=-1
9x^2+6x+1=43x^2+2x-1=0(3x-1)(x+1)=0x1=1/3 x2=-1
x=-1或1/3
