Step 1:

A. The expression is $\"\"$

Multiply and divide the first term with $\"\"$ and second term with $\"\"$

$\"\"$

Distribute terms using distributive property: a( b + c) = ab + ac

$\"\"$

$\"\"$ .

$\"\"$

B. The expression is $\"\"$

$\"\"$

From the difference of two squares formula: $\"\"$

$\"\"$

Multiply the second term with $\"\"$

$\"\"$