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Out of the many uses of the quadratic formula in modern day life, these five were the choices that I thought were most valuable:

1. Computers- Computers are based off of the idea of inputting certain information, and in circle, having that information represented to you in a language or view you can understand. Computers are based off binary codes consisting of 1's and 0's. To get to a certain output, binary codes are often put through a quadratic equation to get to an output. 

2. Artillery (Military)- When it comes to shooting off missiles, a parabola is the track most missiles need to take in order to effectively hit a target. When it comes to a target's location, lots of things come into effect. Coordinates of range, height, distance, wind speed, ect. all play a factor in the missile launch. By plugging in all the information into quadratic formulas and functions, a missile is able to hit its target.

3. Aerial Use- When paratroopers have to land in a certain spot within certain conditions; the quadratic formula becomes the ultimate factor in everything. Given a distance from the ground, the height, the time it takes to land, and the horizontal distance, the quadratic formula can be used after plugging in all this information to safely l and the troopers. 4. Triangles- Although it may not seem like a real life use discovering values of a triangle using the quadratic formula, it is. Architects and builders often use triangles in their work and it is important to know every little detail down to the wire. By knowing all of the measurements surrounding the triangle, an architect ensures that a building will be safe.
 * http://hardcoreharry.wordpress.com/2010/06/13/167/

5. Catapults/ Trebuchets- Much like missiles, these items use the idea of a parabola, starting the object at a starting position and flinging it to it's resting position. With the parabola, the distance, height, speed, ect. is taken into consideration and plugged into the quadratic formula. Although each have very different arcs and speeds, each still uses the basis of the idea of a parabola therefore qualifying it as using the quadratic formula. ==