Consider the quadratic function that has x-intercepts of -1 and -7 and passes throught the point (-2,-20) what is the value of a in the factored form of this function?

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image