Exercice 1 :
A = 2x - 3 + 4x² + 7 - 5x + x²
A = 5x² - 3x + 4
B = 4x - (2x + 3) + 5 - (3 - x)
B = 4x - 2x - 3 + 5 - 3 + x
B = 3x - 1
C = (3x + 5) (4 + x)
C = 12x + 3x² + 20 + 5x
C = 3x² + 17x + 20
D = (2 - 4x) (7x -3)
D = 14x - 6 - 28x² + 12x
D = -28x² + 26x - 6
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Exercice 1 :
A = 2x - 3 + 4x² + 7 - 5x + x²
A = 5x² - 3x + 4
B = 4x - (2x + 3) + 5 - (3 - x)
B = 4x - 2x - 3 + 5 - 3 + x
B = 3x - 1
C = (3x + 5) (4 + x)
C = 12x + 3x² + 20 + 5x
C = 3x² + 17x + 20
D = (2 - 4x) (7x -3)
D = 14x - 6 - 28x² + 12x
D = -28x² + 26x - 6