Bonjour
1)
E = (x + 1)² + (x + 1) (2x - 3)
E = x² + 2x + 1 + 2x² - 3x + 2x - 3
E = x² + 2x² + 2x + 2x - 3x + 1 - 3
E = 3x² + x - 2
2)
E = (x + 1) (x + 1 + 2x - 3)
E = (x + 1) (3x - 2)
3)
(x + 1) (3x - 2) = 0
x + 1 = 0 ou 3x - 2 = 0
x = - 1 3x = 2
x = 2/3.
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Bonjour
1)
E = (x + 1)² + (x + 1) (2x - 3)
E = x² + 2x + 1 + 2x² - 3x + 2x - 3
E = x² + 2x² + 2x + 2x - 3x + 1 - 3
E = 3x² + x - 2
2)
E = (x + 1)² + (x + 1) (2x - 3)
E = (x + 1) (x + 1 + 2x - 3)
E = (x + 1) (3x - 2)
3)
(x + 1) (3x - 2) = 0
x + 1 = 0 ou 3x - 2 = 0
x = - 1 3x = 2
x = 2/3.