Find the intervals on which f(x) is increasing and the intervals on which f(x) is decreasing. Then sketch the graph. Add horizontal tangent lines.

f(x)=7+10xx2

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A.

The function is increasing on

enter your response here.

(Type your answer using interval notation. Use a comma to separate answers as needed.)

B.

There is no solution.