( 4a - 2) ( 4a + 2 ) - ( 4a - 2 )²= 16a² - 4 - ( 16a² - 8a + 4) = 16a² - 4 - 16 a² + 8a - 4 = 8a - 8= 8 ( a - 1 )
( x -1 )² + 17 - ( x + 2 )²= x² - 2 x + 1 + 17 - x² - 4x - 4 = 16 - 6x
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( 4a - 2) ( 4a + 2 ) - ( 4a - 2 )²= 16a² - 4 - ( 16a² - 8a + 4) = 16a² - 4 - 16 a² + 8a - 4 = 8a - 8= 8 ( a - 1 )
( x -1 )² + 17 - ( x + 2 )²= x² - 2 x + 1 + 17 - x² - 4x - 4 = 16 - 6x