The sum of $5 x y$ , $- 2 x y$ , and $- 7 x y$ is .

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Solution

$5 x y$ , $- 2 x y,$ and $- 7 x y$ are like terms. Hence, they can be added.

$∴ 5 x y + (- 2 x y) + (- 7 x y)$
$= 3 x y - 7 x y$
$= - 4 x y$

$∴$ The sum of $5 x y, - 2 x y,$ and $- 7 x y$ is $- 4 x y .$

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