If LaTeX: P=\begin{bmatrix} 3&-4\\
2 &-4
\end{bmatrix}P = [ 3 − 4 2 − 4 ] and LaTeX: P^{-1}=\begin{bmatrix}
p_{1}&p_{2}\\
p_{3}&p_{4}
\end{bmatrix}P − 1 = [ p 1 p 2 p 3 p 4 ], what is the value of LaTeX: p_{3}p 3?