$\"\"$

\

The expression is $\"\"$ .

\

Find the square of sum.

\

$\"\"$ (Square of a sum)

\

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

\

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .