Matrices and Determinants

Let P = \left[ {\matrix{ 1 & 0 & 0 \cr 3 & 1 & 0 \cr 9 & 3 & 1 \cr } } \right] and Q = [q_ij] be two 3 $\times$ 3 matrices such that Q – P⁵ = I₃. Then ${{{q_{21}} + {q_{31}}} \over {{q_{32}}}}$ is equal to :