17. a nonlinear graph has x-intercepts at -8 and -2 and a y-intercept at 3. the graph
has relative minimums at x = -6 and x = 6 and a relative maximum at x = 2. the
graph is positive for x < -8 and x > -2 and negative between x = -8 and x = -2.
as x decreases, y increases and as x increases, y increases.