SA = 54 cm^2
There are 6 sides to a cube they are the same diemensions l * l.
SA = 6l^2
54 = 6 l^2 divide by 6 on both sides of the equal sign
54/6 = l^2
9 = l^2 take the square root of both sides
+ or -3 = l the answer is +3. The value of a side is never negative