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A = ((2/3)*m - 4n)² => Como: (a-b)² = a² - 2*ab + b², entonces:
A = ((2/3)*m)² - 2 * (2/3)*m*4n + (4n)²
A = (4/9)*m² - (16/3)*mn + 16n²
b) Volumen Cubo = Arista³
V = (3y - 2)³ => Como: (a-b)³ = a³ - 3*a²b + 3*ab² - b³, entonces:
V = (3y)³ - 3*(3y)²2 + 3*(3y)2² - 2³
V = 27y³ - 54y² + 36y² - 8