last class in Algebra 2 we learned radiacal functions. radical functions are functions that contains a square root. radical functions are one of the only functions you need to consider the domain because you cannot square root a negative number a get a real number.
| $x$ | $f(x)$ |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 4 | 2 |
| 9 | 3 |
