(Section 1.2: Graphs of Functions) 1.2.14 • fdecreaseson the interval ±1, 1²³´µ. Why? Graphically:If we only consider the part of the graph on the x-interval ±²³´µ, any point must be lowerthan any point to its left. The graph fallsfrom left to right. Numerically:Any x-value in the interval ±²³´µyields a lesserfunction value fx()than any lesser x-value in the interval does. fdecreases on an intervalI ±x2>x1implies that 2<1, ±x1,x2²I. • fincreaseson the interval 1,±²³). §Example 12 (Intervals of Constant Value from a Graph)The graph of gbelow implies that gis constanton the interval ±²³´µ, because the graph is flat there.
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