Answer: b) increasing for x < -4/3 and x > 4/3
decreasing for -4/3 < x < 4/3
Explanation:
Graph the equation and the follow the curve from left to right. When you are going up, it is increasing. When you are going down, it is decreasing.
see the image below. Red is increasing. Blue is decreasing.
The vertices occur when x = -4/3 and x = 4/3