How do you get 40y from the difference of 2 squares with the problem (5y+4+3x)(5y+4-3x)? i understand distribution method. i don't know where the 40y comes from using the special product method.

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 in