2a 2 b 4 5 a July 8, 2019 16 32 64 128 2a 2b 4 5 a solution 2a 2b 4 5 a solve 2a 2b 4 5 a formula A =- 1 b =- 2 2a 2b 4 5 a 2a 2b 4 5 a if a =- 1 b =- 2 - 2 4a(- 5b) 2 5(4a-b)-1 5(3a+2b)