2.1 solving quadratic equations by graphing
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2.1 Solving Quadratic Equations February 21, 2013
Unit 2Quadratic Equations
2.1 Solving Quadratic Equations February 21, 2013
In this chapter, we will look at quadratic equations that follow the formula ax2 + bx + c = 0. You will be asked to solve the quadratic equation.
When we want to solve a quadratic equation, we are looking for the roots of the equations.
We are essentially solving for x.
There are several ways to solve a quadratic equation:
1. Graphing2. Factoring3. Completing the Square4. Using the Quadratic Equation
2.1 Solving Quadratic Equations February 21, 2013
Solving Quadratic Equations by Graphing
When we solve a quadratic equation by graphing, we will find the xintercepts. These are called the roots.
How many roots?
The number of roots varies. There are there possibilities:
2.1 Solving Quadratic Equations February 21, 2013
E.G. The manager of Jasmine's Fine Fashions is investigating the effect that raising or lowering dress prices has on the daily revenue from dress sales. The function R(x) = 100 + 15x x2 gives the store's revenue R, in dollars, from dress sales, where x is the price change, in dollars. What price changes will result in no revenue?
2.1 Solving Quadratic Equations February 21, 2013
E.g. 2. Solve 2x2 + x = 2 by graphing
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