Part of the graph of the function f(3) = (x - 1)(x + 7) is shown
which statements about the function are true? select three
options
the vertex of the function is at (4.-15).
the verter of the function is at (-3,-16).
the graph is increasing on the interval x > -3,
the graph is positive only on the intervals where x< -7
and where
x=1
81-6
4
the graph is negative on the interval x
-4