bonsoir
A = ( 4 x - 3 )² - ( 3 x + 1 ) ( 4 x - 3 )
A = 16 x² - 24 x + 9 - ( 12 x² - 9 x + 4 x - 3 )
A = 16 x² - 24 x + 9 - 12 x² + 9 x - 4 x + 3
A = 4 x² - 17 x + 12
A = ( 4 x - 3 ) ( 4 x - 3 - 3 x - 1 )
= ( 4 x - 3 ) ( x - 4)
tu remplaces x par 4
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bonsoir
A = ( 4 x - 3 )² - ( 3 x + 1 ) ( 4 x - 3 )
A = 16 x² - 24 x + 9 - ( 12 x² - 9 x + 4 x - 3 )
A = 16 x² - 24 x + 9 - 12 x² + 9 x - 4 x + 3
A = 4 x² - 17 x + 12
A = ( 4 x - 3 ) ( 4 x - 3 - 3 x - 1 )
= ( 4 x - 3 ) ( x - 4)
tu remplaces x par 4