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Surface area of a cube

The surface area of a cube is the sum of the area of the six squares that cover it.

What is the surface area? Each face of the cube is a square with sides that are 4 centimeters long.

Find the area of one face: Area = side × side = 4 × 4 = 16

The area of each face is 16 square centimeters. There are 6 faces. Multiply:

 Surface area = 6 × 16 = 96

The surface area of the cube is 96 square centimeters. What is the surface area when a=3?