165321 rounded to the nearest ten thousand

How do i do this activity, is appreciated

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m