Erin is using this area model to factor 6x^2−7x−20. 6x^2 and −20 She puts two terms in the upper left and lower right boxes.
the product of the two terms shown in the area model is
120x^2
-120x
-120x^2
120x
-120x
the sum of the missing two terms in the area model must be
-20
6x^2
-7x