## Algebra: A Combined Approach (4th Edition)

$(4-\pi )x^2$
Area of shaded region $=$ area of square $-$ area of circle $=(2x)^{2} - \pi x^2$ $=2x \times 2x - \pi x^2$ $=4x^2 - \pi x^2$ $=(4-\pi )x^2$