Bonjour,
(a - b)² = a² - 2ab + b²
A = (5 - f)²
A = 5² - 2 * 5 * t + f²
A = 25 - 10t + f²
B = (x - 8)²
B = x² - 2 * 8 * x + 8²
B = x² - 16x + 64
C = (4y - 1)²
C = (4y)² - 2 * 4y * 1 + 1²
C = 16y² - 8y + 1
D = (3x - 7)²
D = (3x)² - 2 * 7 * 3x + 7²
D = 9x² - 42x + 49
E = (6 - 9w)²
E = 6² - 2 * 6 * 9w + (9w)²
E = 36 - 108w + 81w²
F = (p - 2,4)²
F = p² - 2 * 2,4 * p + 2,4²
F = p² - 4,8p + 5,76
G = (10q - 1)²
G = (10q)² - 2 * 1 * 10q + 1²
G = 100q² - 20q + 1
H = (1,4x - 1)²
H = (1,4x)² - 2 * 1 * 1,4x + 1²
H = 1,96x² - 2,8x + 1
