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Subtraction of Unlike Terms

Add : 5m - ...

Question

Add : $5 m - 7 n,$ $3 n - 4 m + 2,$ $2 m - 3 m n - 5$

3m – 4n – 3mn – 3

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3m – 4n – 3mn – 6

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3m – 4n – 5mn – 3

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None of these

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Solution

The correct option is C 3m – 4n – 5mn – 3
$(5 m - 7 n) + (3 n - 4 m + 2) + (2 m - 3 m n - 5)$
$= 5 m - 7 n + 3 n - 4 m + 2 + 2 m - 3 m n - 5$
$= 3 m - 4 n - 3 m n - 3$
Hence the correct answer is $3 m - 4 n - 3 m n - 3$ .

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