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Sagot :

Bonjour

Résoudre :

D= (y-9) (3y+2)-(2y-7) (4y-5)

D = 3y² + 2y - 27y - 18 - (8y² - 10y - 28y + 35)

D = 3y² + 2y - 27y - 18 - 8y² + 10y + 28y - 35

D = 3y² - 8y² + 2y + 10y + 28y - 27y - 18 - 35

D = - 5y² + 13y - 53.

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