Find The $x$ -Values (If Any) at Which the Function $f ( x ) = 13 x ^ { 2 } - 15 x - 15$

Multiple Choice

Find the $x$ -values (if any) at which the function
$f ( x ) = 13 x ^ { 2 } - 15 x - 15$ is not continuous. Which of the discontinuities are removable?

A) $x = 4$ , removable
B) $x = 0$ , removable
C) $x = \frac { 15 } { 26 }$ , not removable.
D) continuous everywhere
E) $x = \frac { 15 } { 26 }$ , removable.