\[(a + 1)x > a^{2} - 1\]
\[(a + 1)x > (a + 1)(a - 1)\]
\[a = - 1,\]
\[то\ 0 \cdot x > 0 \Longrightarrow нет\ решения\]
\[a < - 1,\ \ x < a - 1\]
\[a > - 1,\ \ x > a - 1.\]