Next up on Square One TV: Here 's a quick way to find the square root of four. √4 = √(2•2) = √2•√2. So just find the square root of 2, multiply it by itself and you have the square root of 4!
The beauty about maths are properties. What you said is perfect - now note that sqrt is the inverse of sqr, so you can "cancel" them, and you got the result: 2.
