Plugin Name: quadratic formula
Authors: Minh Tran, Phillip Shin

Function: This plugin takes 3 numbers a, b, and c and computes the roots using the quadratic formula.
	  For example: quadratic 3 6 3 will output 
	  	x1: -1.000000 
	  	x2: -1.000000
	  This plugin will notify the user if a negative determinant is calculated.
	  For example: quadratic 1 2 3 will output
	        Can't handle imaginary numbers

Usage: Use "quadratic a b c" where a, b, c are doubles.