What did the mathematician vivienne malone mayes discover?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Select the quadratic that has root x = 8 and x = -5

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?