What is the sum for 1/8 divided by 1/2

Need on this geometry question. explain how you did it.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?