Ответ:
\[14x^{4} - 28x^{3} + 14x^{2} =\]
\[= 14x^{2}\left( x^{2} - 2x + 1 \right) =\]
\[= 14x^{2}(x - 1)^{2} =\]
\[= 14x^{2}(x - 1)(x - 1).\]
\[14x^{4} - 28x^{3} + 14x^{2} =\]
\[= 14x^{2}\left( x^{2} - 2x + 1 \right) =\]
\[= 14x^{2}(x - 1)^{2} =\]
\[= 14x^{2}(x - 1)(x - 1).\]