arrange in vertical column and solve it
5a²+6ab+7b²,6a²-2ab+3b²,-4a²-ab-2b²
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Solution :
5a²+6a²-4a²+6ab-2ab-ab+7b²+3b²-2b²
7a²+3a²+12b²
Answer is 7a²+3a²+12b²
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