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

9$x^{2}$ - $\frac{1}{4}$
( 3x - $\frac{1}{2}$ )( 3x + $\frac{1}{2}$ the sum and difference of the same two terms $(3x)^{2}$ - $0.5^{2}$ 9$x^{2}$ - 0.25 9$x^{2}$ - $\frac{1}{4}$