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The
following is the graph of f(x) = x(x-3)(x+3)/6.
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The
blue line represents the tangent line to f at the point x .
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The
red line represents a secant line .
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Drag
x + h to examine how the slope of the secant line approaches
the slope of the tangent line.
This is a prototype of JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright ©1990-1998 by Key Curriculum Press, Inc. All rights reserved. Portions of this work were funded by the National Science Foundation (awards DMI 9561674 & 9623018).