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?

Question

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

Quizplus · Accepted Answer

A quadratic function has no x-intercepts if its discriminant is negative. The discriminant of $f(x) = ax^2 - 6x + 3$ is $(-6)^2 - 4(a)(3)$. Setting this less than zero gives $36 - 12a < 0$, which simplifies to $a > 3$.

Provide an Appropriate Response f(x)=ax2−6x+3f ( x ) = a x ^ { 2 } - 6 x + 3f(x)=ax2−6x+3

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