Just need help getting the intervals

12)

Look at the graph, here :  https://www.desmos.com/calculator/wfs9ho2uyr

The graph increases from (-infinity, -4)   and from (-4/3, infinity)

The graph decreases from  (-4, -4/3)

13)

Look at the graph, here : https://www.desmos.com/calculator/n6ss75kmnc

The graph increases from ( -infinity, -1)  and from (-.366 ,  1.366)

The graph decreases from ( -1, -.366)  and from (1.366, infinity)

Please help asap >.<