4 square - 12 AB + 9 b square - 16 c square
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( 4a² - 12ab + 9b² ) - 16c²
= { ( 2a )² - 2 × 2a × 3b + ( 3b )² } - ( 4c )²
= ( 2a - 3b )² - ( 4c )²
= ( 2a - 3b - 4c ) ( 2a - 3b + 4c )
{ a² - b² = ( a - b ) ( a + b ) }
hope it helps....!!
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