## Intermediate Algebra (6th Edition)

$$A=(6y-2x)(6y+2x)$$
Larger rectangle $$A=9y*4y = 36y^2$$ Smaller rectangles $$A=4*x^2 = 4x^2$$ Shaded region $$A=36y^2-4x^2 = (6y-2x)(6y+2x)$$