Video solusi : Rumus : (A + B + C ...)^2 = Kuadrat tiap suku + Lipat dua hasil kali antarsuku Contoh : (a + b + c)^2 = a^2 + b2 + c^2 + 2ab + 2ac + 2bc (a + b + c + d)^2 = a^2 + b^2 + c^2 + d^2 + 2ab + 2ac + 2ad + 2bc + 2bd + 2cd Berapakah : (a - b + c)^2 (a + b - c)^2