a = c2c - b
If c = 2, then a = 4: a = c2c - b ---> 4 = 22·2 - b ---> 4 = 24 - b
---> 4 = 24 / 2b ---> 4·2b = 24 ---> 4·2b = 16
---> 2b = 4 ---> 2b = 22 ---> b = 2
If c = 3, a = c2c - b ---> a = 32·3 - 2 ---> a = 34 ---> a = 81
I don't understand the rest of the question.