Final answer:
To find the length of one side of the square, take the square root of the given area expression.
Step-by-step explanation:
The area of a square is given by the formula A = s^2, where A represents the area and s represents the length of one side of the square. In this case, the given expression 64-16x*x^2 represents the area of the square. To find the length of one side, we need to find the square root of the area expression.
√(64-16x*x^2)