bonjour
A = ( 3 x - 7 ) ( 4 x -5 )
A = 12 x² - 15 x - 28 x + 35
A = 12 x² - 43 x + 35
x = - 3
A = 12 ( - 3 )² - 43 ( - 3 ) + 35
A = 108 + 129 + 35 = 272
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bonjour
A = ( 3 x - 7 ) ( 4 x -5 )
A = 12 x² - 15 x - 28 x + 35
A = 12 x² - 43 x + 35
x = - 3
A = 12 ( - 3 )² - 43 ( - 3 ) + 35
A = 108 + 129 + 35 = 272
Svp