\"\"

\

The expression is \"\".

\

\"\"                 (Substitute x = 2, y = 5 and z = 7)

\

\"\"              (Evaluate power: \"\")

\

\"\"           (Evaluate power: \"\")\"\"

\

\"\"            (Evaluate power: \"\")

\

\"\"                (Multiply:\"\")

\

\"\"                          (Subtract: \"\")

\

\"\"                                  (Add: \"\")\"\"

\

The value of the expression is \"\".