(3a+2b)²-(a-b)²
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(3a+2b)²-(a-b)²
(3a+2b)²-(a-b)²
(3a+2b)²-(a-b)²
=9a²+2×3a×2b+4b²-(a²-2ab+b²)
=9a²+12ab+4b²-a²+2ab-b²
=8a²+14ab+3b²