Math Magic

Think of 2 integer numbers from 0 to 9.
Multiply the first number by 5.
Add 7 to the result.
Multiply the result by 2.
Add the second number to the result.
Given the final result, the 2 integer numbers in your mind can be guessed.

Go the the URL below to view the answer.
http://myfreefilehosting.com/f/611a2c92bf_0.02MB

Chapter 1: Equations - Completing the Square

You may read more about how "Completing the Square" came about, and why "Quadratic" which means "Square" is used. The URL explains the geometric basis of "Completing the Square" from the original method of solving quadratic equations.

http://mathdl.maa.org/convergence/1/?pa=content&sa=viewDocument&nodeId=600