bonjour
A = ( 2 x + 3 ) ( 3 x - 5 ) - 4 x ² - 9
1. A = 6 x² - 10 x + 9 x - 15 - 4 x² - 9
= 2 x² - x - 24
tu remplaces x par - 2
2. A = ( 2 x + 3 ) ( 3 x - 5 ) - 4 x ² - 9
= ( 2 x + 3 ) ( 3 x - 5 ) - 1 ( 2 x - 3 ) ( 2 x + 3 )
= ( 2 x + 3 ) ( 3 x - 5 - 2 x + 3 )
= ( 2 x + 3 ) ( x - 2 )
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bonjour
A = ( 2 x + 3 ) ( 3 x - 5 ) - 4 x ² - 9
1. A = 6 x² - 10 x + 9 x - 15 - 4 x² - 9
= 2 x² - x - 24
tu remplaces x par - 2
2. A = ( 2 x + 3 ) ( 3 x - 5 ) - 4 x ² - 9
= ( 2 x + 3 ) ( 3 x - 5 ) - 1 ( 2 x - 3 ) ( 2 x + 3 )
= ( 2 x + 3 ) ( 3 x - 5 - 2 x + 3 )
= ( 2 x + 3 ) ( x - 2 )