Réponse :

A = -15x² + (3x² - 7x + 4)

A = -15x² + 3x² - 7x + 4

A = (-15 + 3)x² - 7x + 4

A = -12x² - 7x + 4

B = -15x² - (3x² - 7x + 4)

B = -15x² - 3x² + 7x - 4

B = (-15 - 3)x² + 7x - 4

B = -18x² + 7x - 4

C = -15x²(3x² - 7x)

C = -15x² * 3x² + (-15x² * -7x)

C = -45x^4 + 105x^3

D = (-15x² - 2y) - (3x² - 7x)

D = -15x² - 2y - 3x² + 7x

D = (-15 - 3)x² + (7 - 2)y + 7x

D = -18x² + 5y + 7x

Verified answer

Réponse :

bonjour

Explications étape par étape :

A= -15x²+(3x²-7x+4)

= -15x²+3x²-7x+4

= -12x²-7x+4

B= -15x²-(3x²-7x+4)

=-15x²-3x²+7x-4

=-18x²+7x-4

C= -15x²(3x²-7x)

=-45x⁴++105x³

D= (-15x²-2y)-(3x²-7x)

=-15x²-2y-3x²+7x

=-18x²+7x-2y