The expression is .

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

=

=         (Multiply: )

=                (Product of two same signs is positive)

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

=

=         (Multiply: )

=                (Product of two different signs is negative)

=                            (Subtract:  )

The simplified expression is .