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Question

Subtract the sum of 4m2 + 3n- l and 5m2-11n -6l from the sum of 4m2 + 3n + l and 5m2-11n + 6l.

A
18m2 + 14l
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B
14l
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C
-14l
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D
18m2 - 14l
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Solution

The correct option is B 14l
Adding the like terms,
4m2 + 3n- l + 5m2-11n -6l
= 9m2 -8n -7l (i)

4m2 + 3n + l + 5m2-11n + 6l
= 9m2 -8n+7l (ii)

Subtacting (i) from (ii), we get,
9m2 -8n+7l - ( 9m2 -8n -7l)
= 14l


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