\[\boxed{\text{740\ (740).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ x^{4} + 5x² + 9 =\]
\[= \left( x^{4} + 6x^{2} + 9 \right) - x^{2} =\]
\[= \left( x^{2} + 3 \right)^{2} - x^{2} =\]
\[= (x^{2} + 3 - x)(x^{2} + 3 + x)\]
\[2)\ x^{4} - 8x^{2} + 4 =\]
\[= \left( x^{4} - 4x^{2} + 4 \right) - 4x^{2} =\]
\[= \left( x^{2} - 2 \right)^{2} - 4x^{2} =\]
\[= (x^{2} - 2 - 2x)(x^{2} - 2 + 2x)\]