# Chapter 5 - Review - Page 331: 90

$$A=(6y-2x)(6y+2x)$$

#### Work Step by Step

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

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