Bonjour,

Développer puis réduire les expressions :

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) + (4s + 3)²

H = (2s + 10) (s - 5) + 16s² + 24s + 9

H = 2s² - 10s + 10s - 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 + 10.