Long description: Ch25ndiffcentralJPW
Alt text: A graph illustrating a curved function labeled "f" and two dashed lines indicating the slope approximations at points a minus h and a plus h.
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- The image displays a coordinate plane with a vertical axis (labeled with no units) and a horizontal axis labeled "x".
- A smooth, concave-up curve is drawn on the graph, labeled "f", representing a function.
- There are dashed lines drawn to approximate the slope of the curve at different points.
- An arrow points to the dashed line segment near "a minus h" and is accompanied by the text, "This slope approximates \(f'(a)\)".
- A second arrow points to the dashed line segment near "a plus h" and is accompanied by the text, "Slope of line is \(f'(a)\)".
- The horizontal axis has marked points indicating the values "a minus h", "a", and "a plus h", suggesting an interval around the point "a".