20 POINTS SVP MATHS () G ‹ H ‹ I SEULEMENT MERXI

G = 6 (3x - 2) (1 - 5x) - x (7x - 2)
G = 6 (3x - 15x² - 2 + 10x) - 7x² + 2x
G = 18x - 90x² - 12 + 60x - 7x² + 2x
G = - 90x² - 7x² + 18x + 60x + 2x - 12
G = - 79x² + 80x - 12

H = (x + 1) (x + 2) (x - 3)
H = (x² + 2x + x + 2) (x - 3)
H = x³ - 3x² + 2x² - 6x + x² - 3x + 2x - 6
H = x³ - 3x² + 2x² + x² - 6x - 3x + 2x - 6
H = x³ - 7x - 6

I = (x² + 2x - 1) (x² - 2x + 1)
I = x⁴ - 2x³ + x² + 2x³ - 4x² + 2x - x² + 2x - 1
I = x⁴ - 4x² + 4x - 1