-4 (a - 2b) + 8 (a - 2b)^2
Answer :- 4(a+2b)(-1+2a-4b)
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-4 (a - 2b) +8 (a - 2b) ^2
(- 4a +2b) +(8a -16 b) ^2
-4(a+2b) (2a-4b) ^2
therefore
-4(a+2b)(-1+2a-4b)
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