Which of the following statements are true of the graph of the function f(x) = (x+5)(x-3)

_ the graph has a relative maximum
_ the graph has a relative minimum
_ the graph has an x-intercept at (5,0)
_ the graph has an x-intercept at (3,0)
_ the graph has a y-intercept at (0,-15)
_ the axis of symmetry is x= -2