1. an expression is shown below: 3x^3y+12xy-9x^2y-36y part a: rewrite the expression so that the gcf is factored completely. show the steps of your work. part b: rewrite the expression completely factored. show the steps of your work. 2. part a: the area of a square is (9x^2-12x+4) square units. determine the length of each side by factoring the area expression completely. show your work. part b: the area of a rectangle is (25x^2-16y^2) square units. determine the dimensions of the rectangle by factoring the area expression completely. show your work.