\[(p - 3t)^{2} + 52t^{2} - (2p + 4t)(4t - 2p) =\]
\[= p^{2} - 6pt + 9t^{2} + 52t^{2} - 16t^{2} + 4p^{2} =\]
\[= 5p^{2} - 6pt + 45t^{2}\]