développe puis réduis ces expressions.SVPP j'ai vraiment besoin d'aide

Bonjour

A = (9x - 7)²

A = 81x² - 126 + 49

B = (x + 9) (11 - 5x)

B = 11x - 5x² + 99 - 45x

B = - 5x² + 11x - 45x + 99

B = - 5x² - 34x + 99

C = (2x - 3) (2x + 3)

C = 4x²  - 9

D = (11 + 8x)²

D = 121 + 176x + 64x²

E = (x + 1)² + 7x (2 - x)

E = x² + 2x + 1 + 14x - 7x²

E = x² - 7x² + 2x + 14x + 1

E = - 6x² + 16x + 1

F = (x + 3) (2x - 1) - 3x (2x + 5)

F = 2x² - x + 6x - 3 - 6x² - 15x

F = 2x² - 6x² - x - 15x + 6x - 3

F = - 4x² - 10x - 3

G = (4t + 1) (4t - 1) - (3t + 2)²

G = 16t² - 1 - (9t² + 12t + 4)

G = 16t² - 1 - 9t² - 12t - 4

G = 16t² - 9t² - 12t - 1 - 4

G = 7t² - 12t - 5

H = 2 (s + 5) (s - 5) + (4 s + 3)²

H = 2 (s² - 25) + 16s² + 24s + 9

H = 2s² - 50 + 16s² + 24s + 9

H = 2s² + 16s² + 24s - 50 + 9

H = 18s² + 24s - 41

I = (3x + 4)² - (1 - 2x) (6 + x)

I = 9x² + 24x + 16 - (6 + x - 12x - 2x²)

I = 9x² + 24x - 16 - 6 - x + 12x + 2x²

I = 9x² + 2x² + 24x + 12x - x - 16 - 6

I = 11x² + 35x - 22.