Réponses

2014-03-03T21:40:35+01:00
F = (2x+3)² - (x+7)(x-7)
F = (2x)² + 2*2x*3 + 3² - (x² - 7²)
F = 4x² + 12x + 9 - x² + 49
F = 3x² + 12x + 56

G = (3x+1)(x-2) - (2x-3)²
G = 3x² - 6x +x - 2 - ( 4x² - 12x + 9 )
G = 3x² - 5x - 2 - 4x² + 12x - 9
G = -x² + 7x - 11

H = (1/2 + 9x)²
H = (1/2)² + 2*1/2*9x + (9x)²
H = 1/4 + 9x + 81x²