\[x^{2} + 6x - 7 = 0\]
\[D_{1} = 9 + 7 = 16\]
\[x_{1} = - 3 + 4 = 1;\]
\[x_{3} = - 3 - 4 = - 7.\]
\[Ответ:x = - 7;x = 1.\]