|x|- 1= Under the root sign (2y-y? ), both sides are squared at the same time (|x|- 1)? =2y-y？ , moved to (|x|- 1)? +(y- 1)？ = 1, the image is a semicircle, because X takes an absolute value and X has no negative value.
The points of a straight line on the X axis and the Y axis are (-m, 0) (0, -m), the center of the circle is (0, 0), and the radius is root number 2, so m= root number 2.