Add:
i)– 7mn + 5, 12mn + 2, 9mn – 8,
– 2mn – 3
ii)14x + 10y – 12xy – 13, 18 – 7x
– 10y + 8xy, 4xy
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Answer:
i) -7mn+5+12mn+2+9mn-8+(-2mn)-3
= -9mn+9mn+12mn+7-11
= 12mn-4
ii)14x + 10y – 12xy – 13+18 – 7x
– 10y + 8xy+ 4xy
=7x+ 10y–10y-4xy+5
=7x-4xy+5
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