The graph of the function f(x) = (x − 3)(x + 1) is shown.
on a coordinate plane, a parabola opens up. it goes through (negative 1, 0), has a vertex at (1, negative 4), and goes through (3, 0).
which describes all of the values for which the graph is positive and decreasing?
all real values of x where x < −1
all real values of x where x < 1
all real values of x where 1 < x < 3
all real values of x where x > 3