Réponse :
D = (9x+3)^2
D = (9x)^2 + 2*9x*3 + 3^2
D = 81x2 + 54x + 9
B = (7x + 7) * (7x - 7)
B = (7x * 7x) - (7x * 7) + (7*7x) - (7 * 7)
B = 49x2 - 49x + 49x - 49
B = 49x2 - 49
E = (-10x - 3) ^ 2
E = (-10x^2 - 2*10x*-3 - (-3^2))
E = (100x2 - (-60x) -(-9)
E = 100x2 + 60x + 9
C = (x-5)^2
C = x2 + 2*x*5 - (5)^2
C = x2 + 10x + 25
F = (7/9x + 1/5)^2
F = (7/9x)^2 + (2*7 / 9*x*5) + (1/5)^2
F = 49/81x2 + 14/45x + 1/25
Explications étape par étape :
