2) Subtract: a2-2ab-3b2 from the sum of 3a2+5ab-7b2 and 11a2-6ab+2b2.
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Answer:
Sum = 3a²+5ab-7b²+11a²-6ab+2b²
= 14a²-ab-5b²
Difference= 14a²-ab-5b²-(a²-2ab-3b²)
= 14a²-ab-5b²-a²+2ab+3b²
=13a²+ab-2b²
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