$\"\"$

The length(l) of the square is $\"\"$ and its width(w) $\"\"$ .

The perimeter of the square is the sum of four sides of lengths, $\"\"$ .

Substitute the values of $\"\"$ in the formula $\"\"$ .

$\"\"$

Group like terms.

$\"\"$

Combine like terms.

$\"\"$

Apply distributive property: $\"\"$ .

$\"\"$

$\"\"$ . $\"\"$

The perimeter of square is $\"\"$ .