$\"\"$

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The length of any side of the cube, $\"\"$ .

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The surface area of the cube, $\"\"$ .

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The value of $\"\"$ substitute in the equation, $\"\"$ .

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$\"\"$

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Apply power of a product property: $\"\"$ .

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$\"\"$

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Apply power of a power property: $\"\"$ .

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$\"\"$

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$\"\"$

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The surface area of the cube is a monomial, since this expression has product of one number and two variables with nonnegative integer exponents.

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$\"\"$

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The surface area of the cube $\"\"$ .

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The value of $\"\"$ are substitute in the equation, $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The surface area of the cube $\"\"$ .

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$\"\"$

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The monomial expression of surface area of the cube $\"\"$ and the surface area of the cube $\"\"$ .