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Sagot :

Bonjour

C = 1- (4 + x) (x - 2)

C = 1 - (4x - 8 + x² - 2x)

C = 1 - 4x + 8 - x² + 2x

C = - x² - 4x + 2x + 1 + 8

C = - x² - 2x + 9

D = (5x - 3 )(y - 1)

D = 5xy - 5x - 3y + 3

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