Answer: 384 in²
Step-by-step explanation: To get the surface area of a square, you first get the area of one side, which will be 64 inches (because length*width). Then, you multiply the area of the single quare by 6 because a square has 6 sides.
The equation should look something like this: 6*lw ⇒ 6*8*8 ⇒ 384 in²