\[8x^{4}y^{2} - 12x^{2}y^{2} =\]
\[= 4x^{2}y^{2}\left( 2x^{4 - 2} - 3 \right) =\]
\[= 4x^{2}y^{2}\left( 2x^{2} - 3 \right)\]
\[Проверка:\ \]
\[4x^{2}y^{2}\left( 2x^{2} - 3 \right) =\]
\[= 8x^{2 + 2}y^{2} - 12x^{2}y^{2} =\]
\[= 8x^{4}y^{2} - 12x^{2}y^{2};\]
\[8x^{4}y^{2} - 12x^{2}y^{2} = 8x^{4}y^{2} - 12x^{2}y^{2}\]
\[\Longrightarrow верно.\]