\"\"

\

The perimeter of the rectangle is \"\" where \"\".

\

\"\"              (Substitute: \"\")

\

\"\"     (Apply distributive property: \"\")

\

\"\"                (Multiply: \"\")

\

\"\"                      (Subtract: \"\")

\

\"\"               (Apply distributive property: \"\")

\

\"\"                          (Multiply: \"\")

\

\"\"

\

The standard form of the expression is \"\". \ \