If the sum of $13 m n$ , $- 7 n m$ , $4 m$ and $7 m n$ is $x$ , then find the value of $x$ . $[2 M a r k s]$

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Solution

Given, sum of $13 m n$ , $- 7 n m$ , $4 m$ and $7 m n$ is $x$

$⟹$ $13 m n$ +( $- 7 n m$ )+ $4 m$ + $7 m n$ = $x$ $[1 M a r k]$

$⟹$ $13 m n$ + $7 m n$ - $7 n m$ + $4 m$ = $x$

i.e. $x$ = $13 m n$ + $4 m$

Hence, the value of $x$ is $13 m n$ + $4 m$ . $[1 M a r k]$

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