bonsoir
A = 9 x² + 4 x + 49 - ( 4 x² - 20 x + 25)
= 9 x² + 4 x + 49 - 4 x² + 20 x - 25
= 5 x² + 24 x + 24
A = ( 3 x + 7 + 2 x - 5 ) ( 3 x + 7 - 2 x + 5 )
= ( 5 x + 2 ) ( x + 12 )
si x = 3
A = 17 * 15 = 255
( 5 x + 2 ) ( x + 12 ) = 0
x = - 2/5 ou - 12
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bonsoir
A = 9 x² + 4 x + 49 - ( 4 x² - 20 x + 25)
= 9 x² + 4 x + 49 - 4 x² + 20 x - 25
= 5 x² + 24 x + 24
A = ( 3 x + 7 + 2 x - 5 ) ( 3 x + 7 - 2 x + 5 )
= ( 5 x + 2 ) ( x + 12 )
si x = 3
A = 17 * 15 = 255
( 5 x + 2 ) ( x + 12 ) = 0
x = - 2/5 ou - 12