a square- b square+ 8b-16
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a² - b² + 8b - 16
=> a² - { b² - 8b + 16 }
=> a² - { ( b )² - 2. b. 4 + ( 4 )² }
=> ( a )² - ( b - 2 )²
=> ( a + b - 2 ) ( a - b + 2 ) [ • Required answer ]
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