Pouvez vous m aider svp merci beaucoup ! ​

Bonjour

G = (2x + 3) (5x - 8) - (2x - 4) (5x - 1)

G = 10x² - 16x + 15x - 24 - (10x² - 2x - 20x + 4)

G = 10x² - 16x + 15x - 24 - 10x² + 2x + 20x - 4

G = 10x² - 10x² - 16x + 15x + 2x + 20x - 24 - 4

G = 21x - 28

H = (5x - 2) (5x - 8) - (3x - 5) (x + 7)

H = 25x² - 40x - 10x + 16 - (3x² + 21x - 5x - 35)

H = 25x² - 40x - 10x + 16 - 3x² - 21x + 5x + 35

H = 25x² - 3x² - 40x - 10x - 21x + 5x + 16 + 35

H = 22x² - 66x + 51

I = (x + 7) (3 - 2x) + (5x - 2) (4x + 1)

I = 3x - 2x² + 21 - 14x + 20x² + 5x - 8x - 2

I = - 2x² + 20x² + 3x + 5x - 14x - 8x + 21 - 2

I = 18x² - 14x + 19.