Let (x1,x2,x3) and (y1,y2,y3) represent the coordinates with respect to the bases B1 = { (1,0,0),(0,1,0),(0,0,1)} , B2 = { (1,0,0),(0,1,2),(0,2,1) }. If Q(x) = 2x^2+2x1x2-2x2x3+x2^2+x3^2, find the representation of Q in terms of ( y1, y2 ,y3 ).