Question 252891
b has to be one of the factors of 12^2
12^2=144
144 has factors 3*4*3*4
If b is an odd integer, it has to be either 3 or 9.

If b is 3 or 9 then a^2 becomes 4*4 or 3*4*4 and a would be either 4 or 4sqrt3
and a would not be divisible by 3,6,9, nor 12
However if the question were about a^2 and b were 3 then the answer would be only 9.
Did you copy the question correctly?