FlyingCar, 16^(1/2) is both -4 and 4, but sqrt(16) is 4. Roots are a function, and therefore can’t have two solutions.
I was answering a question on Yahoo! Answers math section and somebody was supposed to find the approximate values of various square roots using a method of guessing and testing. I pointed out that most of them could be solved without guessing if you knew a few square roots.
sqrt(75) = 5 * sqrt(3), and if you know that sqrt(3) = 1.723, why guess? But that comes from years of doing trig and looking up the roots and logs and such in the tables at the back of the book, which no one has to do any more, because there are sophisticated calculators.
No one mentions Canary in a Coal Mine or Di Doo Doo Doo or Walking in Your Footsteps or King of Pain? And without King of Pain there’d be no Weird Al’s King of Suede.
There’s a sale on our gabardine suits today. It’s the same old sale as yesterday.
Oh, grow up. No one cares anymore.