Bonjour
identité remarquable à connaître par cœur :
(a + b)^2 = a^2 + 2ab + b^2
(a - b)^2 = a^2 - 2ab + b^2
(a - b)(a + b) = a^2 - b^2
A = (x + 3)^2
A = x^2 + 2 * x * 3 + 3^2
A = x^2 + 6x + 9
B = (3x - 4)^2
B = (3x)^2 - 2 * 3x * 4 + 4^2
B = 9x^2 - 24x + 16
C = (x - 3)(x + 3)
C = x^2 - 3^2
C = x^2 - 9
D = (2x + 3)(2x - 3)
D = (2x)^2 - 3^2
D = 4x^2 - 9
E = (4 - 3x)(3x + 4)
E = (4 - 3x)(4 + 3x)
E = 4^2 - (3x)^2
E = 16 - 9x^2
F = (2x - 3)^2 + (x + 5)(3 - x)
F = 4x^2 - 12x + 9 + x * 3 - x * x + 5 * 3 - 5 * x
F = 4x^2 - 12x + 9 + 3x - x^2 + 15 - 5x
F = 3x^2 - 14x + 24
G = (x - 3)(x + 3) - (4 - 3x)^2
G = x^2 - 9 - (16 - 24x + 9x^2)
G = x^2 - 9 - 16 + 24x - 9x^2
G = -8x^2 + 24x - 25
H = 2(x + 3) + (2x + 3)(2x - 3)
H = 2x + 6 + 4x^2 - 9
H = 4x^2 + 2x - 3
