X2 - 10x + _ "find value that completes the square and rewrite as perfect square" what does it mean by "rewrite as perfect square"

First work with stencil one. use a combination of reflections, rotations, and translations to see whether stencil one will overlap with the original pattern. list the sequence of rigid transformations you used in your attempt, noting the type of transformation, the direction, the coordinates, and the displacement