text: ## Algebra: A Combined Approach (4th Edition)
  
  $\sqrt{\frac{1}{4}}=\frac{1}{2},-\frac{1}{2}$
  Since $(\frac{1}{2})^2=\frac{1}{4}$ and $(-\frac{1}{2})^2=\frac{1}{4}$ the square roots of $\frac{1}{4}$ are $\frac{1}{2},-\frac{1}{2}$