\[x^{2} > 49\]
\[x^{2} - 49 > 0\]
\[(x + 7)(x - 7) > 0\]
\[Ответ:x \in ( - \infty; - 7) \cup (7; + \infty).\]
\[в)\ 4x^{2} - x + 1 > 0\]
\[4x^{2} - x + 1 = 0\]
\[D = 1 - 16 = - 15 < 0\]
\[Парабола,\ ветви\ вверх;x - любое\ число.\ \]
\[Ответ:x \in ( - \infty; + \infty).\]