C. b. 3 July 8, 2019 16 32 64 128 C b 3 C =- b 3 2 B c 3 formula A b c 3 formula class 9 A b c 3 formula proof A b c 3 formula expansion A b c 3 identity A b c 3 4 5 A b c 3 d A b c 3 ab bc ca A b c 3 2 4 1 c 2 b 3 a F c b 3
