(y-2)^2+(1+2y)^2= (y-2)(y-2)+(1+2y)(1+2y) = (y2-2y-2y+4)+(1+2y)(1+2y) = 1(y2-2y-2y+4)+(1+2y+2y+4y2) = y2-2y-2y+4+(1+2y+2y+4y2) = y2-2y-2y+4+1+2y+2y+4y2 = 5y2 + 5