\[\boxed{\text{226.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ x^{4} - 47x^{2} - 98 =\]
\[= \left( x^{2} - 49 \right)\left( x^{2} + 2 \right) =\]
\[= (x - 7)(x + 7)\left( x^{2} + 2 \right);\]
\[\textbf{б)}\ x^{4} - 85x^{2} + 1764 =\]
\[= \left( x^{2} - 36 \right)\left( x^{2} - 49 \right) =\]
\[= (x - 6)(x + 6)(x - 7)(x + 7).\]