x²-3ax+(2a²-ab-b²)=0x²-[(2a+b)+(a-b)]x+(2a+b)(a-b)=0x²-(2a+b)x-(a-b)x+(2a+b)(a-b)=0x[x-(2a+b)]-(a-b)[x-(2a+b)]=0[x-(a-b)][x-(2a+b)]=0x=a-b,x=2a+b