Aisha is finding b+5=-8. find her mistake and correct it.

Base * base * 11 = 1,331
11 base^2 -1,331 = 0
base = 11 inches by 11 inches
The length of each side is 11 inches
The shape of the tank is a 11" by 11" by 11" cube.

The total area of a cube equals edge² • 6
area = 11^2 *6
area = 121 * 6 = 726 square inches

Source
http://www.1728.org/volcube.htm