Вопрос:

Ответ:

\[14x^{4} - 28x^{3} + 14x^{2} =\]

\[= 14x^{2}\left( x^{2} - 2x + 1 \right) =\]

\[= 14x^{2}(x - 1)^{2} =\]

\[= 14x^{2}(x - 1)(x - 1).\]