2x^2-5x+1=0x^2-(5/2)x+(1/2)=0x^2-(5/2)x=-(1/2)x^2-(5/2)x+(25/16)=(17/16)[x-(5/4)]^2=(17/16)x-(5/4)=±(√17/4)x1=(5+√17)/4 x2=(5-√17)/4
