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 The expression is 

=                              (Substitute 5 for k)

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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According order of operations inside the grouping symbols should be evaluated first. First operation is adding the values within the brackets.

=                        (Add:  )

Next operation is evaluating powers.

=                           (Evaluate power: )

Next operation is multiplication.

=                               (Multiply:   )

Next operation is subtraction.

=                                        (Subtract:   )

 The value of the expression is 19.