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Intervals of Increase and Decrease

Intervals of Increase and Decrease. Increase/ Decrease. In order to determine whether a graph is increasing or decreasing, think as if you were driving on the graph. Always start from the left most point of the graph. Things to Remember. All quadratic equations are in the shape of a parabola.

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Intervals of Increase and Decrease

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  1. Intervals of Increase and Decrease

  2. Increase/Decrease • In order to determine whether a graph is increasing or decreasing, think as if you were driving on the graph. • Always start from the left most point of the graph.

  3. Things to Remember • All quadratic equations are in the shape of a parabola. • What does that mean for increasing/decreasing intervals? • Will there ever be an constant interval in a quadratic function? • Intervals of inc. and dec. are based on the domain of the graph. • Is domain x-values or y-values? • What is the domain of all parabolas?

  4. Example 1 • Starting from the left, is the graph increasing or decreasing? • What x-value is all the way to the left? • At what x-value does this parabola switch? • Interval increase: • Interval decrease:

  5. Example 2 • Is this graph increasing or decreasing from the left to the vertex? • Interval Increase: • Interval Decrease

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