Verified answer

Explications étape par étape :

A = 9 - 9x = -9x + 9

B = 9x + 2x = 11x

C = 9 * 2x = 18x

D = 10x - x = 9x

E = 9x * 2x = 18x²

F = -7x - 3 + 4x = -3x - 3

G = -2x * ( -4 ) = 8x

H = 8 - 2x * 4 = 8 - 8x = - 8x + 8    

I =  2a² + 2 - 2a + 2a² = 4a² - 2a + 2