\[Уравнение\ имеет\ \]
\[единственный\ корень\ \]
\[при\ D = 0.\]
\[6x² + 2x - m = 0\]
\[D = 2^{2} - 4 \cdot 6 \cdot ( - m) = 4 + 24m\]
\[4 + 24m = 0\]
\[24m = - 4\]
\[m = - \frac{4}{24}\]
\[m = - \frac{1}{6}\]
\[Ответ:\ при\ m = - \frac{1}{6}.\]