###### Example 1.7.12 Square Root

The symbol \(\sqrt{b}\) has meaning when \(b\geq0\text{.}\) It means the positive number that can be squared to result in \(b\text{.}\)

\(\sqrt{9}=3\)

\(\sqrt{2}\approx1.414\)

\(\sqrt{\frac{9}{16}}=\frac{3}{4}\)

\(\sqrt{-1}\text{ is undefined}\)