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 The expression is 

=                      (Substitute  for n)

To simplify the expression following order of operations to performed:

1.      Evaluate the expressions inside grouping symbols.

2.      Evaluate powers.

3.      Multiply and/or Divide in order from left to right.

4.      Add and/or Subtract in order from left to right.

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In the given expression there are no grouping symbols.

First operation is evaluating power.

                        (Evaluate power:   )

Next operation is multiplication.

=                    (Multiply:   )

Next operation is addition.

 =                            (Add:   )

Next operation is subtraction.

=                                        (Subtract:   )

 The value of the expression is .