Ответ:
\[x^{2} + 6x - 40 = 0\]
\[D_{1} = 9 + 40 = 49\]
\[x_{1} = - 3 + 7 = 4;\]
\[x_{2} = - 3 - 7 = - 10;\]
\[x^{2} + 6x - 40 = (x + 10)(x - 4).\]
\[x^{2} + 6x - 40 = 0\]
\[D_{1} = 9 + 40 = 49\]
\[x_{1} = - 3 + 7 = 4;\]
\[x_{2} = - 3 - 7 = - 10;\]
\[x^{2} + 6x - 40 = (x + 10)(x - 4).\]