add the following: -7mn + 5 , 12mn+ 2 , 9mn, -8 -2mn-3
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Final answer:-5mn
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Q – -7mn + 5 , 12mn + 2 , 9mn , -8 -2mn -3
=> (-7mn + 5) + (12mn + 2) + (9mn) + (-8-2mn-3)
=> -7mn + 5 + 12mn + 2 + 9mn -8 -2mn -3
=> -7mn + 12mn + 9mn -2mn + 5+2-8-3
=> 12mn - 4
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