I saw this problem on the board of one of the classrooms of a high school where I substituted, and thought, “Wow”!!! It’s been a long time since I’ve been in an Algebra class. But looking into the problem and recalling some old mathematical principles that I learned way back when it dawned on me how simple this seemingly complicated problem really is. Click here to view the problem and explanation  http://www.slideshare.net/ymartin3/a-radical-equation