#### Answer

f is not defined for x=1 and x=2

#### Work Step by Step

1. The dashed line x=1 indicates that f(1) does not exist.
No point on the graph has 1 as its x-coordinate.
2. The empty circle at (2,1) indicates that f(2)$\neq 1$, but there is no solid dot to indicate what f(2) should be.
f is not defined for x=1 and x=2