Q71Short answer
Subtract the sum of 12ab –10b2 –18a2 and 9ab + 12b2 + 14a2 from the sum of ab + 2b2 and 3b2 – a2.
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–3a2 + 3b2 – 20ab
Subtract the sum of 12ab –10b2 –18a2 and 9ab + 12b2 + 14a2 from the sum of ab + 2b2 and 3b2 – a2.
–3a2 + 3b2 – 20ab