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2 ème devoir
B = 4 x² - 4 x + 1 - ( 2 x² - 6 x - x + 3 )
= 4 x² - 4 x + 1 - 2 x² + 7 x - 3
= 2 x² + 3 x - 2
B = ( 2 x - 1 ) ( 2 x - 1 - x + 3 )
= ( 2 x - 1 ) ( x + 2 )
B = 0
2 x - 1 = 0 quand x = 1/2
ou x + 2 = 0 quand x = - 2
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bonsoir
2 ème devoir
B = 4 x² - 4 x + 1 - ( 2 x² - 6 x - x + 3 )
= 4 x² - 4 x + 1 - 2 x² + 7 x - 3
= 2 x² + 3 x - 2
B = ( 2 x - 1 ) ( 2 x - 1 - x + 3 )
= ( 2 x - 1 ) ( x + 2 )
B = 0
2 x - 1 = 0 quand x = 1/2
ou x + 2 = 0 quand x = - 2