Which of the following statements are true of the graph of the function f(x)= (x+5)(x-3). select all that apply.
a) the graph has a relative maximum
b) the graph has a relative minimum
c)the graph has an x-intercept at (5,0)
d)the graph has an x-intercept at (3,0)
e) the graph has a y-intercept at (0,-15)
f) the axis of symmetry is x=-2