Given A-B = 2, then the value of algebraic formula 3 (a-b) 2 + 2b-2a is______ ．

3 (a-b) 2 + 2a-2b = 3 (a-b) 2-2 (a-b), substituting A-B = 2, the original formula = 3 × 4-4 = 8

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