(3a-2b)^2-4(3a-2b)-2@
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(3a-2b)²-4(3a-2b)
By using identity (a-b)²
(3a)²-2×3a×2b+(2b)²-4(3a-2b)-2
9a²-12ab+4b²-(12a+8b)-2
9a²-12ab+4b²-(-24a-16b)
9a²-12ab+4b²+24a+16b
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