factories 3(2a-b)²-19(2a-b)+28
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Step-by-step explanation:
3(2a-b)²-19(2a-b)+28
6a²-3b²-38a-19b+28
6×6a-3×3b-38a-19b+28
36a-9b-38a-19b+28
36a-38a-9b-19b+28
-2a-28b+28
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