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A = ( 4 x - 3 )² - ( x - 4 ) ( 4 x - 3 )
A = 16 x² - 24 x + 9 - ( 4 x² - 3 x - 16 x + 12)
A = 16 x² - 24 x + 9 - 4 x² + 19 x - 12
A = 12 x² - 5 x - 3
A = ( 4 x - 3 ) ( 4 x - 3 - x + 4 )
A = ( 4 x - 3 ) ( 3 x + 1 )
si x = - 1
A = ( - 4 - 3 ) ( - 3 + 1 ) = - 7 * - 2 = 14
