Solving a Quadratic Equation

Quadratic equations can be used to model real world data.  Such equations can be solved by both symbolical and graphical methods.

The Problem

The quadratic function given by models the number of AIDS deaths from 1984 to 1994. Determine an equation whose solution is the year when the number of AIDS deaths might reach 500,000. Then solve the equation graphically and symbolically.

Graphical Solution | Symbolic Solution

Special Note

All types of solution methods, including graphical, symbolic and numeric, give approximately the same solution to an equation.  All are equally "good" solutions when all that is needed is an approximate solution.  Exact solutions are usually found by using symbolic methods, as we use in traditional algebra.




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