Provide an Appropriate Response $f ( x ) = a x ^ { 2 } - 6 x + 3$

Multiple Choice

Provide an appropriate response.
-For what values of a does the quadratic function $f ( x ) = a x ^ { 2 } - 6 x + 3$ have no $x$ -intercepts?

A) $a > 9$
B) $a > 3$
C) $a < 9$
D) $a < 3$