Add the terms: $7 x y$ , $2 x y$ , $- 8 x y$ .

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Solution

Given terms are: $7 x y$ , $2 x y$ , $- 8 x y$
The given terms are like terms. So, we can add.
Adding the terms: $7 x y + 2 x y + (- 8 x y)$
$= 7 x y + 2 x y - 8 x y$
$= 9 x y - 8 x y$
$= x y$
Therefore, sum of the given terms is $x y$

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