Answer
A) $(-2,-20)$
B) $(x>-2)$
C) $x<-2$
D) $(-1,0),\ (9,0)$
E) $(0,9)$
F) $f(6)= 15$
Work Step by Step
A) The graph shows that when $x=-2$, $y= -20$. The vertex of the function is at $(-2, -20)$.
B) The function is increasing for $x> -2$.
C)The function is decreasing for $x< -2$.
D The graph crosses the $x$-axis at the $x$ intercepts $(-8,0)$ and $(4,0)$.
E) When $x= 0$, $y= 18$. The vertical intercept is at $(0,18)$.
F) We see that $f(6) = 15$.
