Find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema. f(x) = - 5x? - 70x - 28
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
O A. The function is increasing on
(Type your answer using interval notation. Use a comma to separate answers as needed.)
OB. There is no solution.