Find the x-intercepts.
-$$f ( x ) = 2 x ^ { 2 } - 12 x - 54$$
A) $x$-intercepts $( 9,0 )$ and $( 3,0 )$
B) $x$-intercepts $( 9,0 )$ and $( - 3,0 )$
C) No x-intercepts
D) $x$-intercepts $( - 6,0 )$ and $\left( \frac { 9 } { 2 } , 0 \right)$

Question

Quizplus · Accepted Answer

To find the x-intercepts, set $f(x) = 0$. Thus, $2x^2 - 12x - 54 = 0$. Factoring or using the quadratic formula, we find the roots $x = 9$ and $x = -3$, corresponding to the x-intercepts $(9,0)$ and $(-3,0)$.

Find the X-Intercepts f(x)=2x2−12x−54f ( x ) = 2 x ^ { 2 } - 12 x - 54f(x)=2x2−12x−54

Find the X-Intercepts $f ( x ) = 2 x ^ { 2 } - 12 x - 54$