\"\" \

The expression is \"\".

\

\"\"                           (Substitute x =7.1, y = -2.5)

\

\"\"                                     (Product of two same signs is positive)

\

To subtract 2.5 means add - 2.5.

\

\"\"

\

= 4.6                                                  (Add: \"\")\"\"

\ The value of the expression is 4.6.