64a4b²-c+4bc
(8a+2b-c)
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64a² - ( 4b² + c² - 4bc ) = 64a² - [ (2b)² + c² - 2 × 2b × c ] Since a² + b² - 2ab = ( a - b )² = 64a² - [( 2b - c )²] = (8a)² - [( 2b - c )²
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Answer:
the answer is 8
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