MINI LESSON
Intervals of Increase and Decrease
A parabola changes direction at its vertex.
To the left of the vertex, a parabola may be increasing or decreasing.
To the right of the vertex, the behavior reverses.
An interval of increase describes where the function values get larger as \(x\) increases.
Question 1
A parabola is graphed on the set of axes below. Over which interval is the parabola only increasing?