Find the x-intercepts.
-$$f ( x ) = - x ^ { 2 } + 19 x - 90$$
A) $x$-intercepts $( 9,0 )$ and $( - 10,0 )$
B) $x$-intercepts $( - 9,0 )$ and $( - 10,0 )$
C) No x-intercepts
D) $x$-intercepts $( 9,0 )$ and $( 10,0 )$

Question

Quizplus · Accepted Answer

To find the x-intercepts, set $f(x) = 0$ and solve for $x$. The quadratic equation is $-x^2 + 19x - 90 = 0$. Factoring or using the quadratic formula gives the solutions $x = 9$ and $x = 10$, which correspond to the x-intercepts $(9,0)$ and $(10,0)$.

Find the X-Intercepts f(x)=−x2+19x−90f ( x ) = - x ^ { 2 } + 19 x - 90f(x)=−x2+19x−90

Find the X-Intercepts $f ( x ) = - x ^ { 2 } + 19 x - 90$