Question 974760
Let sqrt be "square root" for short.


We want to simplify sqrt{16x^2}.


Notice that the radicand is 16x^2, which is


a perfect square.


Ask yourself: What number times itself


is 16? You know that 4 times 4 is 16.


This means 4 is part of the answer.


Ask yourself: What term when multiplied


by itself will produce x^2?


How about x? Yes, x times x is x^2.


In conclusion,sqrt{16x^2} is 4x.


Understand?