Question 316852
The area of a square is found using A = side times side.

Let side of square = x

Let A = area of your square

We need to find the value of x which represents one side of your square.
Remember that a square has the same side measurement all around.  This means that x represents every side of your square.  

Let A = 64

64 = x times x

64 = x^2

Can you finish now?