Algebra I
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Bridge On The River Quad
Posted on Mar 12, 2009
Topic: Quadratic Functions
Graph a quadratic function that models the shape of a bridge trestle and then solve the related quadratic equation by completing the square. This list of steps is generalized to deduce the quadratic formula.
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Activity Key Steps:
In Problem 1, students graph a given equation that models the shape of a bridge trestle.
Students use the handhelds’ capabilities to find the x-intercepts and the maximum value on the graph.
Problem 2, allows students to use the handheld to derive the Quadratic Formula and use it to solve for x. They enter values and the quadratic formula into a spreadsheet. The solution is then displayed in the same column as the formula.
At the end of this activity, students will know the difference between equations and functions. They will also become familiar with several methods of finding zeros or x-intercepts.