A 2 b 2 9 ab 3 July 8, 2019 16 32 64 128 A 2 b 2 9 2 ab 3a 3b 4 9 * a 2 b 2 4 3 * ab A 2 b 2 4 c 2 9 ab bc 3 2 3ca If a^2- b^2=9 and 〖(a-b)〗^2= 3 then ab is equal to A * b ^ 2 - 9al A * b ^ 2 - 9
