The user-friendly version of this content is available here.

The following content is copyright (c) 2009-2013 by Goods of the Mind, LLC.

This problem trains for: SAT-I, AMC-8, GMAT, AMC-10.

If:

equation

then what is the value of:

equation

Solution 1: Recognize a perfect square

equation

equation

equation

and multiply:

equation

Solution 2: Multiply first

equation

equation

equation