Let \displaystyle f(x) = 2x+\frac{6}{x} . Find the open intervals on which f is increasing (decreasing). Then determine the x -coordinates of all relative maxima (minima).

** Notes:**
In the first two, your answer should either be a single
interval, such as (0,1), a comma separated list of intervals, such as (-inf, 2), (3,4), or the word
"none".

1. | ||

2. | ||

3. | The relative maxima of | |

4. | The relative minima of |

In the last two, your answer should be a comma separated list of

You can earn partial credit on this problem.