bonjour
A = x² - x + 7x - 7 = x² + 6x - 7
= 1er facteur
B = 2x² - 6x + x - 3 = 2x² - 5x - 3
= second facteur
3) (x+7) (x-1) (2x+1) (x-3) = 0
4) 4 facteurs => 4 solutions
x = - 7 ou x = 1 ou x = -1/2 ou x = 3
5) 4 solutions
6) oui
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bonjour
A = x² - x + 7x - 7 = x² + 6x - 7
= 1er facteur
B = 2x² - 6x + x - 3 = 2x² - 5x - 3
= second facteur
3) (x+7) (x-1) (2x+1) (x-3) = 0
4) 4 facteurs => 4 solutions
x = - 7 ou x = 1 ou x = -1/2 ou x = 3
5) 4 solutions
6) oui