Answer :
answer is 4 and 3
3^2 = 7(3) - 12
9 = 21 - 12
9 = 9
4^2 = 7(4) - 12
16 = 28 - 12
16 = 16
3^2 = 7(3) - 12
9 = 21 - 12
9 = 9
4^2 = 7(4) - 12
16 = 28 - 12
16 = 16