Question 619144
1. Don't need FOIL. Realize that this is a difference of two squares:


*[tex \LARGE (6x-9y)(6x+9y) = (6x)^2 - (9y)^2 = 36x^2 - 81y^2]


2. Area = Length*width, so width = Area/length. Divide: *[tex \LARGE \frac{4x^2 + 19x + 12}{4x+3}]