(1/2)^(x + 1) = 2^(-x-1)
8^x = 2^3x
3x = -x-1
x = -1/4
(9, 6, 5, 3).
9+6+5+3 = 23.
Using the shoelace theorem, we find that the answer is 15.
Using the quadratic formula, we find that the roots are -3+4i and -3-4i.
(m, n) = (9, 4).