1.
If px4+qx3+rx2+sx+t=x2+3xx1x+3x+12xx3x3x+43xpx^4 + qx^3 + rx^2 + sx + t = \begin{vmatrix} x^2+3x & x-1 & x+3 \\ x+1 & 2-x & x-3 \\ x-3 & x+4 & 3x \end{vmatrix}, then tt is equal to: